21(7-b)+6b=57

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Solution for 21(7-b)+6b=57 equation: 



21(7-b)+6b=57

We move all terms to the left:

21(7-b)+6b-(57)=0

We add all the numbers together, and all the variables

21(-1b+7)+6b-57=0

We add all the numbers together, and all the variables

6b+21(-1b+7)-57=0

We multiply parentheses

6b-21b+147-57=0

We add all the numbers together, and all the variables

-15b+90=0

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

-15b=-90

b=-90/-15

b=+6

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