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x in (-oo:+oo)
1 = y*((x*(2*y+3))/2) // - y*((x*(2*y+3))/2)
1-(y*((x*(2*y+3))/2)) = 0
(-1*x*y*(2*y+3))/2+1 = 0
(-1*x*y*(2*y+3))/2+(1*2)/2 = 0
1*2-1*x*y*(2*y+3) = 0
2-2*x*y^2-3*x*y = 0
2-2*x*y^2-3*x*y = 0
2-3*x*y = 0 // - 2
-3*x*y = -2 // : -3*y
x = -2/(-3*y)
x-2/3*y^-1 = 0
(x-2/3*y^-1)/2 = 0
(x-2/3*y^-1)/2 = 0 // * 2
x-2/3*y^-1 = 0
x-2/3*y^-1 = 0 // + -2/3*y^-1
x = -(-2/3*y^-1)
x = 2/3*y^-1
x = 2/3*y^-1
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