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