7f-f=12

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Solution for 7f-f=12 equation: 



7f-f=12

We move all terms to the left:

7f-f-(12)=0

We add all the numbers together, and all the variables

6f-12=0

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

6f=12

f=12/6

f=2

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