12=4+3a-7

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



12=4+3a-7

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(3a-3)+12=0

We get rid of parentheses

-3a+3+12=0

We add all the numbers together, and all the variables

-3a+15=0

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

-3a=-15

a=-15/-3

a=+5

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