71-2f=-13

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Solution for 71-2f=-13 equation: 



71-2f=-13

We move all terms to the left:

71-2f-(-13)=0

We add all the numbers together, and all the variables

-2f+84=0

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

-2f=-84

f=-84/-2

f=+42

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