diff --git a/EasyLean/Basic.lean b/EasyLean/Basic.lean
index 305e1ca..7976724 100644
--- a/EasyLean/Basic.lean
+++ b/EasyLean/Basic.lean
@@ -1,12 +1,6 @@
 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
+import EasyLean.Mathd.Algebra.MathdAlgebra513
 
 theorem eq_four : ∀ a b c d : Nat, a = b → a = d → a = c → c = b := by
   sorry
diff --git a/EasyLean/Mathd/Algebra/MathdAlgebra513.lean b/EasyLean/Mathd/Algebra/MathdAlgebra513.lean
new file mode 100644
index 0000000..2520b89
--- /dev/null
+++ b/EasyLean/Mathd/Algebra/MathdAlgebra513.lean
@@ -0,0 +1,11 @@
+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
+  constructor
+  · linarith [h₀, h₁]
+  · linarith [h₀, h₁]