3a-12=7a-0

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Solution for 3a-12=7a-0 equation: 



3a-12=7a-0

We move all terms to the left:

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

We add all the numbers together, and all the variables

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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