15b-9b-2b=20

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Solution for 15b-9b-2b=20 equation: 



15b-9b-2b=20

We move all terms to the left:

15b-9b-2b-(20)=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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