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x in (-oo:+oo)
Y = (1/3)*(3*y+6)+10 // - (1/3)*(3*y+6)+10
Y-((1/3)*(3*y+6))-10 = 0
(-1/3)*(3*y+6)+Y-10 = 0
Y-1/3*(3*y+6)-10 = 0
Y-1/3*(3*y+6)-10 = 0
Y-y-10-2 = 0
Y-y-12 = 0
Y-y-12 = 0
x belongs to the empty set
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