-20-10b=-15b

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Solution for -20-10b=-15b equation: 



-20-10b=-15b

We move all terms to the left:

-20-10b-(-15b)=0

We get rid of parentheses

-10b+15b-20=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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