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y in (-oo:+oo)
2*y^2-(((10*y)/25)*y)-(5*y^2) = 0
2*y^2+(-2/5)*y^2-5*y^2 = 0
-17/5*y^2 = 0 // : -17/5
y^2 = 0
y = 0
y = 0
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