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8+f=-f-10
We move all terms to the left:
8+f-(-f-10)=0
We add all the numbers together, and all the variables
f-(-1f-10)+8=0
We get rid of parentheses
f+1f+10+8=0
We add all the numbers together, and all the variables
2f+18=0
We move all terms containing f to the left, all other terms to the right
2f=-18
f=-18/2
f=-9
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