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6f-45=51-2f
We move all terms to the left:
6f-45-(51-2f)=0
We add all the numbers together, and all the variables
6f-(-2f+51)-45=0
We get rid of parentheses
6f+2f-51-45=0
We add all the numbers together, and all the variables
8f-96=0
We move all terms containing f to the left, all other terms to the right
8f=96
f=96/8
f=12
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