12+2b=20

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Solution for 12+2b=20 equation: 



12+2b=20

We move all terms to the left:

12+2b-(20)=0

We add all the numbers together, and all the variables

2b-8=0

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

2b=8

b=8/2

b=4

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