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f(-3)= -3a + b= -15
f(3)= 3a + b= 9
--------------------------+
b= -6
--> -3a+b= -15
-3a-6= -15
a=3
f(-2)=ax+b= 3(-2)+(-6)= -12
f(2)=ax+b=3(2)+(-6)=0
------------------------------------------+
-12(hasil)