21-2f=13

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Solution for 21-2f=13 equation: 



21-2f=13

We move all terms to the left:

21-2f-(13)=0

We add all the numbers together, and all the variables

-2f+8=0

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

-2f=-8

f=-8/-2

f=+4

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