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f '(x) = (-1(2x - 5) - 2(2 - x)/(2x - 5)²
= ( -2x + 5 - 4 + x)/(2x - 5)²
= (-x -1)/(2x -5)²
f '(0) = (-0-1)/(2.0 - 5)²
= - 1/25