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