9f+1=91

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Solution for 9f+1=91 equation: 



9f+1=91

We move all terms to the left:

9f+1-(91)=0

We add all the numbers together, and all the variables

9f-90=0

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

9f=90

f=90/9

f=10

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