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6f-5=-9f-9
We move all terms to the left:
6f-5-(-9f-9)=0
We get rid of parentheses
6f+9f+9-5=0
We add all the numbers together, and all the variables
15f+4=0
We move all terms containing f to the left, all other terms to the right
15f=-4
f=-4/15
f=-4/15
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