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3=166-7f+139
We move all terms to the left:
3-(166-7f+139)=0
We add all the numbers together, and all the variables
-(-7f+305)+3=0
We get rid of parentheses
7f-305+3=0
We add all the numbers together, and all the variables
7f-302=0
We move all terms containing f to the left, all other terms to the right
7f=302
f=302/7
f=43+1/7
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