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x in (-oo:+oo)
y-8 = (7/5)*(X-10) // - (7/5)*(X-10)
y-((7/5)*(X-10))-8 = 0
(-7/5)*(X-10)+y-8 = 0
y-7/5*(X-10)-8 = 0
y-7/5*(X-10)-8 = 0
y-7/5*X-8+14 = 0
y-7/5*X+6 = 0
y-7/5*X+6 = 0
x belongs to the empty set
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