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x in (-oo:+oo)
3*y*(y+5)+3*(1/2)*Y = 252 // - 252
3*y*(y+5)+3*(1/2)*Y-252 = 0
3*y*(y+5)+(3*Y)/2-252 = 0
(2*3*y*(y+5))/2+(3*Y)/2+(-252*2)/2 = 0
2*3*y*(y+5)+3*Y-252*2 = 0
3*Y+6*y^2+30*y-504 = 0
(3*Y+6*y^2+30*y-504)/2 = 0
(3*Y+6*y^2+30*y-504)/2 = 0 // * 2
3*Y+6*y^2+30*y-504 = 0
x belongs to the empty set
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