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21+18f=19f-14
We move all terms to the left:
21+18f-(19f-14)=0
We get rid of parentheses
18f-19f+14+21=0
We add all the numbers together, and all the variables
-1f+35=0
We move all terms containing f to the left, all other terms to the right
-f=-35
f=-35/-1
f=+35
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