3=-15+b

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Solution for 3=-15+b equation: 



3=-15+b

We move all terms to the left:

3-(-15+b)=0

We add all the numbers together, and all the variables

-(b-15)+3=0

We get rid of parentheses

-b+15+3=0

We add all the numbers together, and all the variables

-1b+18=0

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

-b=-18

b=-18/-1

b=+18

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