12+2a=20

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Solution for 12+2a=20 equation: 



12+2a=20

We move all terms to the left:

12+2a-(20)=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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