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13-19f=-18f-17+16
We move all terms to the left:
13-19f-(-18f-17+16)=0
We add all the numbers together, and all the variables
-19f-(-18f-1)+13=0
We get rid of parentheses
-19f+18f+1+13=0
We add all the numbers together, and all the variables
-1f+14=0
We move all terms containing f to the left, all other terms to the right
-f=-14
f=-14/-1
f=+14
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