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-1+7f-3=4+9f
We move all terms to the left:
-1+7f-3-(4+9f)=0
We add all the numbers together, and all the variables
7f-(9f+4)-1-3=0
We add all the numbers together, and all the variables
7f-(9f+4)-4=0
We get rid of parentheses
7f-9f-4-4=0
We add all the numbers together, and all the variables
-2f-8=0
We move all terms containing f to the left, all other terms to the right
-2f=8
f=8/-2
f=-4
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