21-6(b-4)=57

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Solution for 21-6(b-4)=57 equation: 



21-6(b-4)=57

We move all terms to the left:

21-6(b-4)-(57)=0

We add all the numbers together, and all the variables

-6(b-4)-36=0

We multiply parentheses

-6b+24-36=0

We add all the numbers together, and all the variables

-6b-12=0

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

-6b=12

b=12/-6

b=-2

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