15=3a-8a

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Solution for 15=3a-8a equation: 



15=3a-8a

We move all terms to the left:

15-(3a-8a)=0

We add all the numbers together, and all the variables

-(-5a)+15=0

We get rid of parentheses

5a+15=0

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

5a=-15

a=-15/5

a=-3

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