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y in (-oo:+oo)
4*5*(1/2)*y*y = 250 // - 250
4*5*(1/2)*y*y-250 = 0
10*y^2 = 250 // : 10
y^2 = 25
y^2 = 25 // ^ 1/2
abs(y) = 5
y = 5 or y = -5
y in { 5, -5 }
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