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-2f-4=6+2f
We move all terms to the left:
-2f-4-(6+2f)=0
We add all the numbers together, and all the variables
-2f-(2f+6)-4=0
We get rid of parentheses
-2f-2f-6-4=0
We add all the numbers together, and all the variables
-4f-10=0
We move all terms containing f to the left, all other terms to the right
-4f=10
f=10/-4
f=-2+1/2
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