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-x2 + 5x - 4 = 0.

Then,

x2 - 5x + 4 = (x - 4)(x - 1) = 0; whence,

x = 1 or 4.

Checking,

-1 + 5 - 4 = 0; and

-16 + 20 - 4 = 0.

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15y ago

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