Answer:
f(x) = 5 - 3x
f(-5) = 5 - 3(-5) = 5 + 15 = 20
f(2/3) = 5 - 3(2/3) = 5 - 2 = 3
f(4.5) = 5 - 3(4.5) = 5 - 13.5 = -8.5
5 - 3x = 17--->3x = 12--->x = 4
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