4a+12-2a+12=20

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Solution for 4a+12-2a+12=20 equation: 



4a+12-2a+12=20

We move all terms to the left:

4a+12-2a+12-(20)=0

We add all the numbers together, and all the variables

2a+4=0

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

2a=-4

a=-4/2

a=-2

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