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x in (-oo:+oo)
Y+10 = (9/4)*(X+9) // - (9/4)*(X+9)
Y-((9/4)*(X+9))+10 = 0
(-9/4)*(X+9)+Y+10 = 0
Y-9/4*(X+9)+10 = 0
Y-9/4*(X+9)+10 = 0
Y-9/4*X-81/4+10 = 0
Y-9/4*X-41/4 = 0
Y-9/4*X-41/4 = 0
x belongs to the empty set
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