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x in (-oo:+oo)
a = (h*(j+k))/2 // - (h*(j+k))/2
a-((h*(j+k))/2) = 0
(-1*h*(j+k))/2+a = 0
(-1*h*(j+k))/2+(2*a)/2 = 0
2*a-1*h*(j+k) = 0
2*a-(h*j)-(h*k) = 0
(2*a-(h*j)-(h*k))/2 = 0
(2*a-(h*j)-(h*k))/2 = 0 // * 2
2*a-(h*j)-(h*k) = 0
x belongs to the empty set
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