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8=9f+4-7f
We move all terms to the left:
8-(9f+4-7f)=0
We add all the numbers together, and all the variables
-(2f+4)+8=0
We get rid of parentheses
-2f-4+8=0
We add all the numbers together, and all the variables
-2f+4=0
We move all terms containing f to the left, all other terms to the right
-2f=-4
f=-4/-2
f=+2
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