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8f+9=5f+3
We move all terms to the left:
8f+9-(5f+3)=0
We get rid of parentheses
8f-5f-3+9=0
We add all the numbers together, and all the variables
3f+6=0
We move all terms containing f to the left, all other terms to the right
3f=-6
f=-6/3
f=-2
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