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x in (-oo:+oo)
y+10 = (9/2)*(X-10) // - (9/2)*(X-10)
y-((9/2)*(X-10))+10 = 0
(-9/2)*(X-10)+y+10 = 0
y-9/2*(X-10)+10 = 0
y-9/2*(X-10)+10 = 0
y-9/2*X+10+45 = 0
y-9/2*X+55 = 0
y-9/2*X+55 = 0
x belongs to the empty set
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