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x in (-oo:+oo)
(1/2)*r-5 = 3*h // - 3*h
(1/2)*r-(3*h)-5 = 0
(1/2)*r-3*h-5 = 0
1/2*r-3*h-5 = 0
x naleu017Cy do R
x in (-oo:+oo)
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