Using doctest-mode inside python-mode (3/7)

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def x_intercept(m, b):
    """
    Return the x intercept of the line y=m*x+b.
        >>> x_intercept(3, 6)
        -2.0
        >>> x_intercept(-4, 2)
        0.5.
    """
    return -float(b)/m










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