18=-3(b-3)

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Solution for 18=-3(b-3) equation: 



18=-3(b-3)

We move all terms to the left:

18-(-3(b-3))=0



We calculate terms in parentheses: -(-3(b-3)), so:

-3(b-3)

We multiply parentheses

-3b+9

Back to the equation:

-(-3b+9)



We get rid of parentheses

3b-9+18=0

We add all the numbers together, and all the variables

3b+9=0

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

3b=-9

b=-9/3

b=-3

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