7=5+-b

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Solution for 7=5+-b equation: 



7=5+-b

We move all terms to the left:

7-(5+-b)=0

We add all the numbers together, and all the variables

-(-1b)+7=0

We get rid of parentheses

1b+7=0

We add all the numbers together, and all the variables

b+7=0

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

b=-7

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