63=-6a-3a

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Solution for 63=-6a-3a equation: 



63=-6a-3a

We move all terms to the left:

63-(-6a-3a)=0

We add all the numbers together, and all the variables

-(-9a)+63=0

We get rid of parentheses

9a+63=0

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

9a=-63

a=-63/9

a=-7

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