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y=x^2-5x+4
x-5=x^2-5x+4
-x^2+5x+x-4-5=0
-x^2+6x-9=0
dikali -1
=x^2-6x+9=0
(x-3)(x-3)
maka x1=x2=3
y=x-5
y=3-5= -2