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8+2f=-2f-8
We move all terms to the left:
8+2f-(-2f-8)=0
We get rid of parentheses
2f+2f+8+8=0
We add all the numbers together, and all the variables
4f+16=0
We move all terms containing f to the left, all other terms to the right
4f=-16
f=-16/4
f=-4
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