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10-20f=-19f-7
We move all terms to the left:
10-20f-(-19f-7)=0
We get rid of parentheses
-20f+19f+7+10=0
We add all the numbers together, and all the variables
-1f+17=0
We move all terms containing f to the left, all other terms to the right
-f=-17
f=-17/-1
f=+17
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