How to plot (y vs x) a not invertible function say F(x,y)=const?

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I am trying to plot (y vs x) for a not invertible function PolyLogarithm[1.5,y/x]=const. Any Ideas how to do this, say on Mathematica?

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Plot3D[PolyLog[1.5, y/x], {x, -8, 8}, {y, -8, 8}]

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ContourPlot[PolyLog[1.5, y/x] == 2, {x, -8, 8}, {y, -8, 8}]

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