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x in (-oo:+oo)
(1/3)*h-(4*((2/3)*k-3)) = (2/3)*k-6 // - (2/3)*k-6
(1/3)*h-(4*((2/3)*k-3))-((2/3)*k)+6 = 0
(1/3)*h-4*((2/3)*k-3)+(-2/3)*k+6 = 0
h/3-4*(2/3*k-3)+(-2*k)/3+6 = 0
(-4*3*(2/3*k-3))/3+h/3+(-2*k)/3+(3*6)/3 = 0
h-4*3*(2/3*k-3)-2*k+3*6 = 0
h-8*k-2*k+18+36 = 0
h-10*k+18+36 = 0
h-10*k+54 = 0
(h-10*k+54)/3 = 0
(h-10*k+54)/3 = 0 // * 3
h-10*k+54 = 0
x belongs to the empty set
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