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2f+8=-f-10
We move all terms to the left:
2f+8-(-f-10)=0
We add all the numbers together, and all the variables
2f-(-1f-10)+8=0
We get rid of parentheses
2f+1f+10+8=0
We add all the numbers together, and all the variables
3f+18=0
We move all terms containing f to the left, all other terms to the right
3f=-18
f=-18/3
f=-6
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