diff --git a/EasyLean/Basic.lean b/EasyLean/Basic.lean
index 305e1ca..5c0c53b 100644
--- a/EasyLean/Basic.lean
+++ b/EasyLean/Basic.lean
@@ -1,12 +1,5 @@
 import Mathlib.Data.Real.Basic
 import Mathlib.Tactic.Linarith
 
-theorem mathd_algebra_513
-  (a b : ℝ)
-  (h₀ : 3 * a + 2 * b = 5)
-  (h₁ : a + b = 2) :
-  a = 1 ∧ b = 1 := by
-  sorry
-
 theorem eq_four : ∀ a b c d : Nat, a = b → a = d → a = c → c = b := by
   sorry
diff --git a/EasyLean/Basic_mathd_algebra_513/mathd_algebra_513_prover.lean b/EasyLean/Basic_mathd_algebra_513/mathd_algebra_513_prover.lean
new file mode 100644
index 0000000..8b2fe85
--- /dev/null
+++ b/EasyLean/Basic_mathd_algebra_513/mathd_algebra_513_prover.lean
@@ -0,0 +1,8 @@
+import Mathlib
+
+theorem mathd_algebra_513 (a b : ℝ) (h₀ : 3 * a + 2 * b = 5) (h₁ : a + b = 2) : a = 1 ∧ b = 1 := by
+  constructor
+  · linarith [h₀, h₁]
+  · linarith [h₀, h₁]
+
+
diff --git a/build_filtered.sh b/build_filtered.sh
new file mode 100644
index 0000000..7e82dc1
--- /dev/null
+++ b/build_filtered.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+
+echo "Running lake build (quiet mode, errors only)..."
+
+# Run lake build with --quiet, capture output and exit code
+OUTPUT=$(lake exe cache get && lake build --quiet 2>&1)
+EXIT_CODE=$?
+
+# Count errors and warnings
+ERROR_COUNT=$(echo "$OUTPUT" | grep -c "^error:" || true)
+WARNING_COUNT=$(echo "$OUTPUT" | grep -c "^warning:" || true)
+
+echo "════════════════════════════════════════════════"
+echo "Build Summary:"
+echo "  Warnings: $WARNING_COUNT (suppressed in output below)"
+echo "  Errors:   $ERROR_COUNT"
+echo "  Exit code: $EXIT_CODE"
+echo "════════════════════════════════════════════════"
+
+if [ $EXIT_CODE -ne 0 ]; then
+    echo ""
+    echo "❌ BUILD FAILED - Showing errors only:"
+    echo ""
+    echo "$OUTPUT" | grep -A 3 "^error:"
+else
+    echo "✅ BUILD SUCCEEDED"
+fi
+
+exit $EXIT_CODE