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Y in (-oo:+oo)
((3*Y)/2)*Y-(((2.5*Y)/5)*Y)-5-2 = 0
((3*Y)/2)*Y-0.5*Y^2-5-2 = 0
1*Y^2 = 7 // : 1
Y^2 = 7
Y^2 = 7 // ^ 1/2
abs(Y) = 7^(1/2)
Y = 7^(1/2) or Y = -7^(1/2)
Y in { 7^(1/2), -7^(1/2) }
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