3a+12=7a-20

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Solution for 3a+12=7a-20 equation: 



3a+12=7a-20

We move all terms to the left:

3a+12-(7a-20)=0

We get rid of parentheses

3a-7a+20+12=0

We add all the numbers together, and all the variables

-4a+32=0

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

-4a=-32

a=-32/-4

a=+8

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