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-7(2f+1)=7
We move all terms to the left:
-7(2f+1)-(7)=0
We multiply parentheses
-14f-7-7=0
We add all the numbers together, and all the variables
-14f-14=0
We move all terms containing f to the left, all other terms to the right
-14f=14
f=14/-14
f=-1
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