70-2b=b+7

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Solution for 70-2b=b+7 equation: 



70-2b=b+7

We move all terms to the left:

70-2b-(b+7)=0

We get rid of parentheses

-2b-b-7+70=0

We add all the numbers together, and all the variables

-3b+63=0

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

-3b=-63

b=-63/-3

b=+21

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