3a-21=6a+15

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Solution for 3a-21=6a+15 equation: 



3a-21=6a+15

We move all terms to the left:

3a-21-(6a+15)=0

We get rid of parentheses

3a-6a-15-21=0

We add all the numbers together, and all the variables

-3a-36=0

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

-3a=36

a=36/-3

a=-12

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