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5=4f-7
We move all terms to the left:
5-(4f-7)=0
We get rid of parentheses
-4f+7+5=0
We add all the numbers together, and all the variables
-4f+12=0
We move all terms containing f to the left, all other terms to the right
-4f=-12
f=-12/-4
f=+3
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