90=3(b+21)

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Solution for 90=3(b+21) equation:



90=3(b+21)
We move all terms to the left:
90-(3(b+21))=0
We calculate terms in parentheses: -(3(b+21)), so:
3(b+21)
We multiply parentheses
3b+63
Back to the equation:
-(3b+63)
We get rid of parentheses
-3b-63+90=0
We add all the numbers together, and all the variables
-3b+27=0
We move all terms containing b to the left, all other terms to the right
-3b=-27
b=-27/-3
b=+9

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