diff --git a/EasyLean/Basic.lean b/EasyLean/Basic.lean
index 0dbd32e..59a71bc 100644
--- a/EasyLean/Basic.lean
+++ b/EasyLean/Basic.lean
@@ -1,11 +1 @@
-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
-
--- This verision is in branch
+import EasyLean.MathdAlgebra513
diff --git a/EasyLean/MathdAlgebra513.lean b/EasyLean/MathdAlgebra513.lean
new file mode 100644
index 0000000..7173fe1
--- /dev/null
+++ b/EasyLean/MathdAlgebra513.lean
@@ -0,0 +1,9 @@
+import Mathlib
+
+namespace EasyLean
+
+theorem mathd_algebra_513 (a b : Real) (h0 : 3 * a + 2 * b = 5) (h1 : a + b = 2) :
+    a = 1 ∧ b = 1 := by
+  constructor <;> linarith [h0, h1]
+
+end EasyLean