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x in (-oo:+oo)
Y-14 = (11/4)*(X-21) // - (11/4)*(X-21)
Y-((11/4)*(X-21))-14 = 0
(-11/4)*(X-21)+Y-14 = 0
Y-11/4*(X-21)-14 = 0
Y-11/4*(X-21)-14 = 0
Y-11/4*X-14+231/4 = 0
Y-11/4*X+175/4 = 0
Y-11/4*X+175/4 = 0
x belongs to the empty set
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