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F(2)=7--->f(2)=7+a+3
f(2)=a=-10
A.f(x)=-7+x
B.f(-1)=-1-7+3=-5
C.f(-2)+f(-1)
F(-2)=-2-7+3=6
F(-2)+f(-1)=6+(-5)=1
D.f(2x-5)=2x-5-7+3
=2x-9