3a-7=12+7a

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



3a-7=12+7a

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

3a-7a-12-7=0

We add all the numbers together, and all the variables

-4a-19=0

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

-4a=19

a=19/-4

a=-4+3/4

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