Evaluate each function for the given input values. 6. For f(x) = x + 7, find f(x) when x = 3 and when x = -5.
7. For g(x) = -2x, find g(x) when x = 4 and when x = -1.
8. For h(x) = 3x - 1, find h(x) when x = -2 and when x = 7.

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