90=3-3b

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Solution for 90=3-3b equation: 



90=3-3b

We move all terms to the left:

90-(3-3b)=0

We add all the numbers together, and all the variables

-(-3b+3)+90=0

We get rid of parentheses

3b-3+90=0

We add all the numbers together, and all the variables

3b+87=0

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

3b=-87

b=-87/3

b=-29

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