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-3a + b = -15 ........................(1)
f(3) = 9
3a + b = 9 ..............................(2)
dari (1) dan (2)
2b = -6
b=-3 maka a=(9-(-3))/3=4
sehingga f(x) = 4x-3
f(-2) = -8-3=-11
f(2) = 8-3 = 5
Jadi f(-2)+f(2) = -11 + 5 =-6