12+4b=2b-20

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



12+4b=2b-20

We move all terms to the left:

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

We get rid of parentheses

4b-2b+20+12=0

We add all the numbers together, and all the variables

2b+32=0

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

2b=-32

b=-32/2

b=-16

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