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Verified answer
F(x) = (2m+1)x-5ma)
f(4)=(2m+1)4-5m
-2=8m+4-5m
3m=-6
m=-3
b) f(x)=(2.-3+1)x-5.-3 = -5x + 15
c) f(-2) = -5.-2 + 15 = 25
f(4)-f(-2)=-2 - 25 = -27
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