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80=8-12f
We move all terms to the left:
80-(8-12f)=0
We add all the numbers together, and all the variables
-(-12f+8)+80=0
We get rid of parentheses
12f-8+80=0
We add all the numbers together, and all the variables
12f+72=0
We move all terms containing f to the left, all other terms to the right
12f=-72
f=-72/12
f=-6
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