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6f+9=10f-7
We move all terms to the left:
6f+9-(10f-7)=0
We get rid of parentheses
6f-10f+7+9=0
We add all the numbers together, and all the variables
-4f+16=0
We move all terms containing f to the left, all other terms to the right
-4f=-16
f=-16/-4
f=+4
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