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100-6f=80-5f
We move all terms to the left:
100-6f-(80-5f)=0
We add all the numbers together, and all the variables
-6f-(-5f+80)+100=0
We get rid of parentheses
-6f+5f-80+100=0
We add all the numbers together, and all the variables
-1f+20=0
We move all terms containing f to the left, all other terms to the right
-f=-20
f=-20/-1
f=+20
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