20=12+7b

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Solution for 20=12+7b equation: 



20=12+7b

We move all terms to the left:

20-(12+7b)=0

We add all the numbers together, and all the variables

-(7b+12)+20=0

We get rid of parentheses

-7b-12+20=0

We add all the numbers together, and all the variables

-7b+8=0

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

-7b=-8

b=-8/-7

b=1+1/7

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