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-19+10f+5=20+12f
We move all terms to the left:
-19+10f+5-(20+12f)=0
We add all the numbers together, and all the variables
10f-(12f+20)-19+5=0
We add all the numbers together, and all the variables
10f-(12f+20)-14=0
We get rid of parentheses
10f-12f-20-14=0
We add all the numbers together, and all the variables
-2f-34=0
We move all terms containing f to the left, all other terms to the right
-2f=34
f=34/-2
f=-17
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