概要信息：

import sympy as sp
import sys
import re
from sympy.parsing.sympy_parser import (
    parse_expr,
    implicit_multiplication_application,
    standard_transformations,
    convert_xor,
)

# 包含隐式乘法和 ^ 转 ** 的转换规则
transformations = standard_transformations + (
    implicit_multiplication_application,
    convert_xor,
)

def parse_equation(eq_str):
    if '=' in eq_str:
        left, right = eq_str.split('=', 1)
        expr_str = f"({left.strip()}) - ({right.strip()})"
    else:
        expr_str = ...