$\"\"$ $\"\"$ $\"\"$

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The word "less than" indicates subtraction and the symbol is ( $\"\"$ ).

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The word "plus" indicates addition and the symbol ( $\"\"$ )

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$\"\"$

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The equation is $\"\"$

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$\"\"$

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According to subtraction property of equality: Subtract $\"\"$ from each side.

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$\"\"$

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$\"\"$ (Apply commutative property of addition: $\"\"$ )

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$

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$\"\"$ (Subtract 6 from each side)

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$\"\"$ (Apply additive inverse property: $\"\"$ )

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$\"\"$ (Apply additive identity property: $\"\"$ )

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$\"\"$ (Subtract: $\"\"$ )

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$\"\"$

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According to multiplication property of equality: Multiply each side by 5.

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$\"\"$

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$\"\"$ (Cancel comon terms)

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$\"\"$ (Multiply: $\"\"$ )

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$\"\"$

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According to division property of equality:If $\"\"$ then $\"\"$ .

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$\"\"$ (Divide each side by 9)

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$\"\"$ (Cancel common terms)

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$\"\"$ (Divide: $\"\"$ )

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$\"\"$

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The number is $\"\"$ .