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-2f-7(-18f-18)=-2f
We move all terms to the left:
-2f-7(-18f-18)-(-2f)=0
We multiply parentheses
-2f+126f-(-2f)+126=0
We get rid of parentheses
-2f+126f+2f+126=0
We add all the numbers together, and all the variables
126f+126=0
We move all terms containing f to the left, all other terms to the right
126f=-126
f=-126/126
f=-1
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