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744=9f+135
We move all terms to the left:
744-(9f+135)=0
We get rid of parentheses
-9f-135+744=0
We add all the numbers together, and all the variables
-9f+609=0
We move all terms containing f to the left, all other terms to the right
-9f=-609
f=-609/-9
f=67+2/3
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