7a+20=3a+12

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



7a+20=3a+12

We move all terms to the left:

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

We get rid of parentheses

7a-3a-12+20=0

We add all the numbers together, and all the variables

4a+8=0

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

4a=-8

a=-8/4

a=-2

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