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7f=-4+5f
We move all terms to the left:
7f-(-4+5f)=0
We add all the numbers together, and all the variables
7f-(5f-4)=0
We get rid of parentheses
7f-5f+4=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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