3a=7a-12

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Solution for 3a=7a-12 equation: 



3a=7a-12

We move all terms to the left:

3a-(7a-12)=0

We get rid of parentheses

3a-7a+12=0

We add all the numbers together, and all the variables

-4a+12=0

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

-4a=-12

a=-12/-4

a=+3

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