90=2(15+b)

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Solution for 90=2(15+b) equation: 



90=2(15+b)

We move all terms to the left:

90-(2(15+b))=0

We add all the numbers together, and all the variables

-(2(b+15))+90=0



We calculate terms in parentheses: -(2(b+15)), so:

2(b+15)

We multiply parentheses

2b+30

Back to the equation:

-(2b+30)



We get rid of parentheses

-2b-30+90=0

We add all the numbers together, and all the variables

-2b+60=0

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

-2b=-60

b=-60/-2

b=+30

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