-63=-6a+15

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Solution for -63=-6a+15 equation: 



-63=-6a+15

We move all terms to the left:

-63-(-6a+15)=0

We get rid of parentheses

6a-15-63=0

We add all the numbers together, and all the variables

6a-78=0

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

6a=78

a=78/6

a=13

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