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`x^2 = 5x-4`
`x^2-5x+4 = 0`
`x^2-4x-x+4 = 0`
`x(x-4)-1(x-4) = 0`
`(x-4)(x-1) = 0`
`x = 4` or `x = 1`
So the answers are x = 1 and x = 4
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