def neg_btn(value):
    """Return the current value multiplied by -1."""
    if value.count(" "):
        val_list = value.split()
        num1 = val_list[0]
        math_symbol = val_list[1]
        num2 = float(val_list[2]) * -1
        num2 = str(num2)
        return f"{num1} {math_symbol} {num2}"
    elif float(value) != 0:
        return float(value) * -1
    else:
        return 0