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30-3f=14-f
We move all terms to the left:
30-3f-(14-f)=0
We add all the numbers together, and all the variables
-3f-(-1f+14)+30=0
We get rid of parentheses
-3f+1f-14+30=0
We add all the numbers together, and all the variables
-2f+16=0
We move all terms containing f to the left, all other terms to the right
-2f=-16
f=-16/-2
f=+8
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