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-6-7=-7f
We move all terms to the left:
-6-7-(-7f)=0
We add all the numbers together, and all the variables
-(-7f)-13=0
We get rid of parentheses
7f-13=0
We move all terms containing f to the left, all other terms to the right
7f=13
f=13/7
f=1+6/7
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