15=3+b

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Solution for 15=3+b equation:


15=3+b

We simplify the equation to the form, which is simple to understand 
15=3+b

We move all terms containing b to the left and all other terms to the right. 
-1b=+3-15

We simplify left and right side of the equation. 
-1b=-12

We divide both sides of the equation by -01 to get b. 
b=12

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