3a+12=5a+7.

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Solution for 3a+12=5a+7. equation: 



3a+12=5a+7.

We move all terms to the left:

3a+12-(5a+7.)=0

We add all the numbers together, and all the variables

3a-(5a+7)+12=0

We get rid of parentheses

3a-5a-7+12=0

We add all the numbers together, and all the variables

-2a+5=0

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

-2a=-5

a=-5/-2

a=2+1/2

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