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y in (-oo:+oo)
((5*y)/4)*y-12 = 0
5/4*y^2 = 12 // : 5/4
y^2 = 48/5
y^2 = 48/5 // ^ 1/2
abs(y) = (48/5)^(1/2)
y = (48/5)^(1/2) or y = -(48/5)^(1/2)
y in { (48/5)^(1/2), -(48/5)^(1/2) }
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