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f(-3) = 17 - 4.(-3) = 29
f(0) = 17 - 4.0 = 17
f(2) = 17 - 4.2 = 9
f(x) = 17 - 4x
(-41) = 17 - 4x
4x = 17 + 41
4x = 58
x = 14,5