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The equation is
Apply subtraction property of inequality: Subtract 18 from each side.
(Additive inverse property: )
(Additive identity property : )
(Subtract: )
Graph the solution set on a number line
Note: A circle means that this point is not included in the solution set.
Check:
To check, substitute 21, a number and less than 22, in .
(Substitute )
(Add : )
The inequality is true
The inequality solution is .
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