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Solve 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 x is - 3

23. F (x) = - 3x+3,when x is 4

24. F (x) = - 8/9 + 2x, when x is 2.

25. F (x) = 2x+2,when x is 0.

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