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f(-3) = a(-3) + b = - 15
f(3) = a(3) + b = 9
f(-3) = -3a+b = - 15
f(3) = 3a+b = 9
a = - 6
3a+b = 9
3(-6)+b = 9
18+b = 9
b = 9
f(-2) + f(2)
[-6(-2)+9] + [-6(2)+9]
(12+9) + (-12+9)
21+-6
15