9a-15=6a-42

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Solution for 9a-15=6a-42 equation: 



9a-15=6a-42

We move all terms to the left:

9a-15-(6a-42)=0

We get rid of parentheses

9a-6a+42-15=0

We add all the numbers together, and all the variables

3a+27=0

We move all terms containing a to the left, all other terms to the right

3a=-27

a=-27/3

a=-9

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