15=3+4b

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Solution for 15=3+4b equation: 



15=3+4b

We move all terms to the left:

15-(3+4b)=0

We add all the numbers together, and all the variables

-(4b+3)+15=0

We get rid of parentheses

-4b-3+15=0

We add all the numbers together, and all the variables

-4b+12=0

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

-4b=-12

b=-12/-4

b=+3

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