def main():
if len(sys.argv) == 1:
error("Missing input")
eq = Equation(sys.argv[1])
eq.parse_equation()
eq.powers_right = eq.create_dict(resolve_rpn(create_rpn(eq.tokens_right)))
eq.powers_left = eq.create_dict(resolve_rpn(create_rpn(eq.tokens_left)))
eq.reduce_equation()
eq.print_reduced_equation()
eq.solve_equation()
