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x(x-6)
x^2-6x=0
-2 y 8
(x+2)(x-8)
x^2-6x-16
12
x^2=144
3 y 7
(x-3)(x-7)
x^2-10x+21
-3 y 3
(x+3)(x-3)
x^2-9=0