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(-5f+8)=4
We move all terms to the left:
(-5f+8)-(4)=0
We get rid of parentheses
-5f+8-4=0
We add all the numbers together, and all the variables
-5f+4=0
We move all terms containing f to the left, all other terms to the right
-5f=-4
f=-4/-5
f=4/5
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