20+b=-20-3b

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Solution for 20+b=-20-3b equation: 



20+b=-20-3b

We move all terms to the left:

20+b-(-20-3b)=0

We add all the numbers together, and all the variables

b-(-3b-20)+20=0

We get rid of parentheses

b+3b+20+20=0

We add all the numbers together, and all the variables

4b+40=0

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

4b=-40

b=-40/4

b=-10

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