13+5b=b-7

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Solution for 13+5b=b-7 equation: 



13+5b=b-7

We move all terms to the left:

13+5b-(b-7)=0

We get rid of parentheses

5b-b+7+13=0

We add all the numbers together, and all the variables

4b+20=0

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

4b=-20

b=-20/4

b=-5

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