13b-1=90

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Solution for 13b-1=90 equation: 



13b-1=90

We move all terms to the left:

13b-1-(90)=0

We add all the numbers together, and all the variables

13b-91=0

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

13b=91

b=91/13

b=7

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