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F(x) = ax+b
F(-3) = -3a+b = -15
F(3) = 3a+b = 9
------------------------------- -
-6a = -24
*a = 4 dan b = 3*

F(-2) = -2(4)+3 = -8+3 = -5
F(2) = 2(4)+3 = 8+3 = 11

F(-2)+f(2) = -5 + 11 = 6