-20b=-80

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Solution for -20b=-80 equation: 



-20b=-80

We move all terms to the left:

-20b-(-80)=0

We add all the numbers together, and all the variables

-20b+80=0

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

-20b=-80

b=-80/-20

b=+4

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