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x in (-oo:+oo)
(h-4)/j = k // - k
(h-4)/j-k = 0
(h-4)/j+(j*(-k))/j = 0
h+j*(-k)-4 = 0
h-(j*k)-4 = 0
(h-(j*k)-4)/j = 0
(h-(j*k)-4)/j = 0 // * j
h-(j*k)-4 = 0
x belongs to the empty set
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