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4f=300+6f
We move all terms to the left:
4f-(300+6f)=0
We add all the numbers together, and all the variables
4f-(6f+300)=0
We get rid of parentheses
4f-6f-300=0
We add all the numbers together, and all the variables
-2f-300=0
We move all terms containing f to the left, all other terms to the right
-2f=300
f=300/-2
f=-150
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