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6f+169=2f+133
We move all terms to the left:
6f+169-(2f+133)=0
We get rid of parentheses
6f-2f-133+169=0
We add all the numbers together, and all the variables
4f+36=0
We move all terms containing f to the left, all other terms to the right
4f=-36
f=-36/4
f=-9
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