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f(-3)=-15
f(3)=9
f(-3)=a(-3)-b= -15
-3a-b = -15.
3a + b = 15.....(1)
f(3) =a(3)-b =9
3a-b =9........(2)
dari (1) dan (2) diperoleh a=1 dan b=12,. f(x)=x-12
f(-2)=-2-12=-14
f(2) = 2-12=--10
f(-2)+f(2) = -14+ (-10)= - 24