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-3f-20=19f+17+7
We move all terms to the left:
-3f-20-(19f+17+7)=0
We add all the numbers together, and all the variables
-3f-(19f+24)-20=0
We get rid of parentheses
-3f-19f-24-20=0
We add all the numbers together, and all the variables
-22f-44=0
We move all terms containing f to the left, all other terms to the right
-22f=44
f=44/-22
f=-2
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