(3+5)=15+b

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Solution for (3+5)=15+b equation: 



(3+5)=15+b

We move all terms to the left:

(3+5)-(15+b)=0

We add all the numbers together, and all the variables

-(b+15)+8=0

We get rid of parentheses

-b-15+8=0

We add all the numbers together, and all the variables

-1b-7=0

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

-b=7

b=7/-1

b=-7

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