20+b=4b-7

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Solution for 20+b=4b-7 equation: 



20+b=4b-7

We move all terms to the left:

20+b-(4b-7)=0

We get rid of parentheses

b-4b+7+20=0

We add all the numbers together, and all the variables

-3b+27=0

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

-3b=-27

b=-27/-3

b=+9

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