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src/basic-syntax/variables.md

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+# Variables
+
+Rust provides type safety via static typing. Variable bindings are immutable by
+default:
+
+```rust,editable
+fn main() {
+    let x: i32 = 10;
+    println!("x: {x}");
+    // x = 20;
+    // println!("x: {x}");
+}
+```