b+13=7b-65

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Solution for b+13=7b-65 equation: 



b+13=7b-65

We move all terms to the left:

b+13-(7b-65)=0

We get rid of parentheses

b-7b+65+13=0

We add all the numbers together, and all the variables

-6b+78=0

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

-6b=-78

b=-78/-6

b=+13

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