3+12-2f=7

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Solution for 3+12-2f=7 equation: 



3+12-2f=7

We move all terms to the left:

3+12-2f-(7)=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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