15=b+7

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Solution for 15=b+7 equation: 



15=b+7

We move all terms to the left:

15-(b+7)=0

We get rid of parentheses

-b-7+15=0

We add all the numbers together, and all the variables

-1b+8=0

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

-b=-8

b=-8/-1

b=+8

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