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-15 = -3a + b 9 = 3a + b
-3a + b = -15
3a + b = 9
-6a = -24
a = 4 jadi -3a +b = -15
-3 . 4 + b = -15
-12 + b = -15
b = -3
f(-2) + f(2) =
(-2 . 4 +(-3)) + (2 . 4 +(-3)) =
-11 + 5 = -6