20=4+2b

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Solution for 20=4+2b equation: 



20=4+2b

We move all terms to the left:

20-(4+2b)=0

We add all the numbers together, and all the variables

-(2b+4)+20=0

We get rid of parentheses

-2b-4+20=0

We add all the numbers together, and all the variables

-2b+16=0

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

-2b=-16

b=-16/-2

b=+8

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