-15b+20b+7=-13

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Solution for -15b+20b+7=-13 equation: 



-15b+20b+7=-13

We move all terms to the left:

-15b+20b+7-(-13)=0

We add all the numbers together, and all the variables

5b+20=0

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

5b=-20

b=-20/5

b=-4

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