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-15 = -3a +b
f(3) = 3a +b
9 = 3a +b
-15 = -3a +b
-6 = 2b
b = -3
3a -3 = 9
3a = 12
a = 4
f(x) = 4x - 3
f(-2) = -8 - 3 = -11
f(2) = 8 - 3 = 5
f(-2) +f(2) = -11 + 5 = -6