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4f-12=5f+51
We move all terms to the left:
4f-12-(5f+51)=0
We get rid of parentheses
4f-5f-51-12=0
We add all the numbers together, and all the variables
-1f-63=0
We move all terms containing f to the left, all other terms to the right
-f=63
f=63/-1
f=-63
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