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7f-4-10f=-4f-2
We move all terms to the left:
7f-4-10f-(-4f-2)=0
We add all the numbers together, and all the variables
-3f-(-4f-2)-4=0
We get rid of parentheses
-3f+4f+2-4=0
We add all the numbers together, and all the variables
f-2=0
We move all terms containing f to the left, all other terms to the right
f=2
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