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-13-19f=-2f+14-20f
We move all terms to the left:
-13-19f-(-2f+14-20f)=0
We add all the numbers together, and all the variables
-19f-(-22f+14)-13=0
We get rid of parentheses
-19f+22f-14-13=0
We add all the numbers together, and all the variables
3f-27=0
We move all terms containing f to the left, all other terms to the right
3f=27
f=27/3
f=9
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