20=-2b+4

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Solution for 20=-2b+4 equation: 



20=-2b+4

We move all terms to the left:

20-(-2b+4)=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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