3a+7=12+4a

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



3a+7=12+4a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a-4a-12+7=0

We add all the numbers together, and all the variables

-1a-5=0

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

-a=5

a=5/-1

a=-5

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