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y in (-oo:+oo)
((3*y)/2)*y-(((7*y)/3)*y)-1+3 = 1 // - 1
((3*y)/2)*y-(((7*y)/3)*y)-1-1+3 = 0
(-7/3)*y^2+((3*y)/2)*y-1-1+3 = 0
-5/6*y^2 = -1 // : -5/6
y^2 = 6/5
y^2 = 6/5 // ^ 1/2
abs(y) = (6/5)^(1/2)
y = (6/5)^(1/2) or y = -(6/5)^(1/2)
y in { (6/5)^(1/2), -(6/5)^(1/2) }
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