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