# Chapter 1 - Tools of Geometry - 1-3 Measuring Segments - Apply What You've Learned: c

If I substitute the value that I found for $a$ into both expressions and check that the expressions simplify to the same value, that will show that I solved the equation correctly.

#### Work Step by Step

$a=6$ $5(6)+12= 42$ $9(6)-12= 42$

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