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y in (-oo:+oo)
((5*y)/3)*y-15 = 0
5/3*y^2 = 15 // : 5/3
y^2 = 9
y^2 = 9 // ^ 1/2
abs(y) = 3
y = 3 or y = -3
y in { 3, -3 }
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