9=b+7

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Solution for 9=b+7 equation: 



9=b+7

We move all terms to the left:

9-(b+7)=0

We get rid of parentheses

-b-7+9=0

We add all the numbers together, and all the variables

-1b+2=0

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

-b=-2

b=-2/-1

b=+2

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