-b+20=3b-20-20

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



-b+20=3b-20-20

We move all terms to the left:

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

We add all the numbers together, and all the variables

-b-(3b-40)+20=0

We add all the numbers together, and all the variables

-1b-(3b-40)+20=0

We get rid of parentheses

-1b-3b+40+20=0

We add all the numbers together, and all the variables

-4b+60=0

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

-4b=-60

b=-60/-4

b=+15

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