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7-5(4f+12)+12f+20=68
We move all terms to the left:
7-5(4f+12)+12f+20-(68)=0
We add all the numbers together, and all the variables
12f-5(4f+12)-41=0
We multiply parentheses
12f-20f-60-41=0
We add all the numbers together, and all the variables
-8f-101=0
We move all terms containing f to the left, all other terms to the right
-8f=101
f=101/-8
f=-12+5/8
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