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x in (-oo:+oo)
(1*(3*y+710))/7+Y = 150 // - 150
(1*(3*y+710))/7+Y-150 = 0
(3*y+710)/7+Y-150 = 0
(3*y+710)/7+(7*Y)/7+(-150*7)/7 = 0
7*Y+3*y-150*7+710 = 0
7*Y+3*y-1050+710 = 0
7*Y+3*y-340 = 0
(7*Y+3*y-340)/7 = 0
(7*Y+3*y-340)/7 = 0 // * 7
7*Y+3*y-340 = 0
x belongs to the empty set
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