You can put this solution on YOUR website! There is one real solution and you guessed it two complex solutions. Complex solutions always come in pairs.
y = (7/3)^(2/3)
y = (-7/3)^(2/3)=-0.879605+1.52352i
y = -(-1)^(1/3) (7/3)^(2/3)=-0.879605-1.52352i
