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-20f+14=-19f
We move all terms to the left:
-20f+14-(-19f)=0
We get rid of parentheses
-20f+19f+14=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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