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-20-20-14f=-19f+20
We move all terms to the left:
-20-20-14f-(-19f+20)=0
We add all the numbers together, and all the variables
-14f-(-19f+20)-40=0
We get rid of parentheses
-14f+19f-20-40=0
We add all the numbers together, and all the variables
5f-60=0
We move all terms containing f to the left, all other terms to the right
5f=60
f=60/5
f=12
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