괄호 안의 항을 2, 3, 4 항으로 설정하는 기능 추가

components/game/VariableFeedbackPanel.tsx

@@ -6,7 +6,6 @@ import AnswerResultLine from "@/components/game/AnswerResultLine";
 import type {
   VariableGradeResult,
   VariableParenthesisProblem,
-  VariableParenthesisTerm,
 } from "@/lib/engine/variable-types";
 import { formatVariableTermLatex } from "@/lib/engine/variable-parenthesis";
 
@@ -21,12 +20,6 @@ function formatSignedNumber(value: number) {
   return value < 0 ? `(${value})` : `${value}`;
 }
 
-function formatSignedTerm(term: VariableParenthesisTerm, sign: 1 | -1) {
-  const coefficient = term.coefficient * sign;
-
-  return formatVariableTermLatex({ ...term, coefficient });
-}
-
 export default function VariableFeedbackPanel({
   result,
   problem,
@@ -34,14 +27,18 @@ export default function VariableFeedbackPanel({
   onNext,
 }: VariableFeedbackPanelProps) {
   const nextButtonRef = useRef<HTMLButtonElement>(null);
-  const signedTerms = [
-    formatSignedTerm(problem.firstTerm, 1),
-    formatSignedTerm(problem.secondTerm, problem.operator === "-" ? -1 : 1),
-  ] as const;
+  const signedTerms = problem.terms.map((term, index) =>
+    formatVariableTermLatex({
+      ...term,
+      coefficient:
+        index > 0 && problem.operators[index - 1] === "-"
+          ? -term.coefficient
+          : term.coefficient,
+    }),
+  );
   const feedbackItems = signedTerms.map((termLatex, index) => {
-    const termIndex = index as 0 | 1;
-    const userAnswer = result.userAnswer[termIndex];
-    const correctAnswer = result.correctAnswer[termIndex];
+    const userAnswer = result.userAnswer[index];
+    const correctAnswer = result.correctAnswer[index];
 
     return {
       formulaLatex: `${formatSignedNumber(problem.multiplier)}\\times ${termLatex}`,