-140=-28+-21b

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Solution for -140=-28+-21b equation: 



-140=-28+-21b

We move all terms to the left:

-140-(-28+-21b)=0

We add all the numbers together, and all the variables

-(-21b)-140=0

We get rid of parentheses

21b-140=0

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

21b=140

b=140/21

b=6+2/3

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