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-12f-19-10f=-20f+17
We move all terms to the left:
-12f-19-10f-(-20f+17)=0
We add all the numbers together, and all the variables
-22f-(-20f+17)-19=0
We get rid of parentheses
-22f+20f-17-19=0
We add all the numbers together, and all the variables
-2f-36=0
We move all terms containing f to the left, all other terms to the right
-2f=36
f=36/-2
f=-18
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