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12f+16=-20-6f
We move all terms to the left:
12f+16-(-20-6f)=0
We add all the numbers together, and all the variables
12f-(-6f-20)+16=0
We get rid of parentheses
12f+6f+20+16=0
We add all the numbers together, and all the variables
18f+36=0
We move all terms containing f to the left, all other terms to the right
18f=-36
f=-36/18
f=-2
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