-4(b-20)+-1=-1

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Solution for -4(b-20)+-1=-1 equation: 



-4(b-20)+-1=-1

We move all terms to the left:

-4(b-20)+-1-(-1)=0

We add all the numbers together, and all the variables

-4(b-20)=0

We multiply parentheses

-4b+80=0

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

-4b=-80

b=-80/-4

b=+20

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