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f(-3) = -3x + b = -15
F(3) = 3x + b = 9 -
-6x = -24
x = 4
f(3) = 3(4) + b = 9
12 + b = 9
b = 9-12 = -3
f(-2) = -2(4) + (-3) = -11
f(2) = 2(4) + (-3) = 5
maka, f(-2) + f(2) = -11 +5 = -6