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5+4f-5f=f-7
We move all terms to the left:
5+4f-5f-(f-7)=0
We add all the numbers together, and all the variables
-1f-(f-7)+5=0
We get rid of parentheses
-1f-f+7+5=0
We add all the numbers together, and all the variables
-2f+12=0
We move all terms containing f to the left, all other terms to the right
-2f=-12
f=-12/-2
f=+6
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