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x in (-oo:+oo)
x*((2*x+3)/(-3)) = x // - x
x*((2*x+3)/(-3))-x = 0
(x*(2*x+3))/(-3)-x = 0
(x*(2*x+3))/(-3)+(-3*(-x))/(-3) = 0
x*(2*x+3)-3*(-x) = 0
2*x^2+6*x = 0
2*x^2+6*x = 0
2*x*(x+3) = 0
x+3 = 0 // - 3
x = -3
2*x*(x+3) = 0
(2*x*(x+3))/(-3) = 0
(2*x*(x+3))/(-3) = 0 // * -3
2*x*(x+3) = 0
( 2*x )
2*x = 0 // : 2
x = 0
( x+3 )
x+3 = 0 // - 3
x = -3
x in { 0, -3 }
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