$\"\"$

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The equation is $\"\"$ .

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Solve the equation $\"\"$ for b.

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Group like terms.

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$\"\"$

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Combine like terms.

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$\"\"$ . $\"\"$

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Add 9 to each side.

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$\"\"$

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$\"\"$

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$\"\"$ .

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Divide each side by 7.

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$\"\"$

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$\"\"$ . $\"\"$

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To check the solution, substitute the value of $\"\"$ in the original equation.

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$

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$\"\"$ .

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The above statement is true, so the value of $\"\"$ is the solution of original equation. $\"\"$

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The value of $\"\"$ .