(4a+12)-7+a=6a-21

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Solution for (4a+12)-7+a=6a-21 equation: 



(4a+12)-7+a=6a-21

We move all terms to the left:

(4a+12)-7+a-(6a-21)=0

We add all the numbers together, and all the variables

a+(4a+12)-(6a-21)-7=0

We get rid of parentheses

a+4a-6a+12+21-7=0

We add all the numbers together, and all the variables

-1a+26=0

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

-a=-26

a=-26/-1

a=+26

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