91=2f+45

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Solution for 91=2f+45 equation: 



91=2f+45

We move all terms to the left:

91-(2f+45)=0

We get rid of parentheses

-2f-45+91=0

We add all the numbers together, and all the variables

-2f+46=0

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

-2f=-46

f=-46/-2

f=+23

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