10b+21=91

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Solution for 10b+21=91 equation: 



10b+21=91

We move all terms to the left:

10b+21-(91)=0

We add all the numbers together, and all the variables

10b-70=0

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

10b=70

b=70/10

b=7

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