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80=8*2f/2
We move all terms to the left:
80-(8*2f/2)=0
We add all the numbers together, and all the variables
-(+8*2f/2)+80=0
We get rid of parentheses
-8*2f/2+80=0
We multiply all the terms by the denominator
-8*2f+80*2=0
We add all the numbers together, and all the variables
-8*2f+160=0
Wy multiply elements
-16f+160=0
We move all terms containing f to the left, all other terms to the right
-16f=-160
f=-160/-16
f=+10
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