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-10=f/2+-12
We move all terms to the left:
-10-(f/2+-12)=0
We add all the numbers together, and all the variables
-(f/2-12)-10=0
We get rid of parentheses
-f/2+12-10=0
We multiply all the terms by the denominator
-f+12*2-10*2=0
We add all the numbers together, and all the variables
-1f+4=0
We move all terms containing f to the left, all other terms to the right
-f=-4
f=-4/-1
f=+4
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