21b-15b+8b+11b=25

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Solution for 21b-15b+8b+11b=25 equation: 



21b-15b+8b+11b=25

We move all terms to the left:

21b-15b+8b+11b-(25)=0

We add all the numbers together, and all the variables

25b-25=0

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

25b=25

b=25/25

b=1

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