Update quant_solver.py

quant_solver.py

@@ -671,7 +671,11 @@ def solve_linear_equation(text: str, help_mode: str) -> Optional[SolverResult]:
     if sp is None:
         return None
 
-    lower = text.lower().replace("^", "**")
+    lower = text.lower()
+    lower = lower.replace("^", "**")
+    lower = lower.replace("−", "-")
+    lower = lower.replace("–", "-")
+    lower = lower.replace("—", "-")
     choices = extract_choices(text)
 
     m = re.search(