7a+12=5a+20

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Solution for 7a+12=5a+20 equation: 



7a+12=5a+20

We move all terms to the left:

7a+12-(5a+20)=0

We get rid of parentheses

7a-5a-20+12=0

We add all the numbers together, and all the variables

2a-8=0

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

2a=8

a=8/2

a=4

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