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-2(2f-4)=-4(-f+2)

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-2(2f-4) =-4(-f+2)
 
you would multiply -2 by both 2f and  -4 on the left side, and you would multiply -4 with -f and 2 on the right side, so you get
 
-4f + 8 = 4f -8  
 
subtract 4f on both sides to get rid of the 4f on the right side
 
-4f - 4f + 8 = 4f - 4f - 8
 
-8f + 8 = -8
 
-8f = -16
 
f = -16/-8
 
f=2