a+15=3a+7

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Solution for a+15=3a+7 equation: 



a+15=3a+7

We move all terms to the left:

a+15-(3a+7)=0

We get rid of parentheses

a-3a-7+15=0

We add all the numbers together, and all the variables

-2a+8=0

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

-2a=-8

a=-8/-2

a=+4

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