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Solve for the value of the function using the given value of x.

21. f(x) = -2x, when x is - 1.
22. f(x) = 5x - 5, when xiz - 3.
23. f(x) = -3x +3, when x is 4.
24. f(x) = 2x + 2, when is x 0.
25. f(x) = - + 2x, when x is 2.​