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10f=12-(2f)
We move all terms to the left:
10f-(12-(2f))=0
We add all the numbers together, and all the variables
10f-(-2f+12)=0
We get rid of parentheses
10f+2f-12=0
We add all the numbers together, and all the variables
12f-12=0
We move all terms containing f to the left, all other terms to the right
12f=12
f=12/12
f=1
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