20-17b=-20-15b-7b

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Solution for 20-17b=-20-15b-7b equation: 



20-17b=-20-15b-7b

We move all terms to the left:

20-17b-(-20-15b-7b)=0

We add all the numbers together, and all the variables

-17b-(-22b-20)+20=0

We get rid of parentheses

-17b+22b+20+20=0

We add all the numbers together, and all the variables

5b+40=0

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

5b=-40

b=-40/5

b=-8

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