from spb import plotgrid
expr = Ne(x*y, 1)
p1 = graphics(
    implicit_2d(expr, (x, -10, 10), (y, -10, 10)),
    grid=False, title="$%s$ : First approach" % latex(expr),
    aspect="equal", show=False)
p2 = graphics(
    implicit_2d(x < 20, (x, -10, 10), (y, -10, 10)),
    implicit_2d(Eq(*expr.args), (x, -10, 10), (y, -10, 10),
        color="w", show_in_legend=False),
    grid=False, title="$%s$ : Second approach" % latex(expr),
    aspect="equal", show=False)
plotgrid(p1, p2, nc=2)  # doctest: +SKIP