91=19+4b

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Solution for 91=19+4b equation: 



91=19+4b

We move all terms to the left:

91-(19+4b)=0

We add all the numbers together, and all the variables

-(4b+19)+91=0

We get rid of parentheses

-4b-19+91=0

We add all the numbers together, and all the variables

-4b+72=0

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

-4b=-72

b=-72/-4

b=+18

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