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-7=3f+7
We move all terms to the left:
-7-(3f+7)=0
We get rid of parentheses
-3f-7-7=0
We add all the numbers together, and all the variables
-3f-14=0
We move all terms containing f to the left, all other terms to the right
-3f=14
f=14/-3
f=-4+2/3
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