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-2(f+-1)=10
We move all terms to the left:
-2(f+-1)-(10)=0
We add all the numbers together, and all the variables
-2(f-1)-10=0
We multiply parentheses
-2f+2-10=0
We add all the numbers together, and all the variables
-2f-8=0
We move all terms containing f to the left, all other terms to the right
-2f=8
f=8/-2
f=-4
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