3a+7=4a-12

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Solution for 3a+7=4a-12 equation: 



3a+7=4a-12

We move all terms to the left:

3a+7-(4a-12)=0

We get rid of parentheses

3a-4a+12+7=0

We add all the numbers together, and all the variables

-1a+19=0

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

-a=-19

a=-19/-1

a=+19

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