-21=-4b+6b

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Solution for -21=-4b+6b equation: 



-21=-4b+6b

We move all terms to the left:

-21-(-4b+6b)=0

We add all the numbers together, and all the variables

-(+2b)-21=0

We get rid of parentheses

-2b-21=0

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

-2b=21

b=21/-2

b=-10+1/2

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