let x = 10; let y = 5 x += y; console.log(x) console.log("======="); let a = 10; let b = 5 a += b; // artinya -> a = a + b; a -= b; // artinya -> a = a - b; a *= b; // artinya -> a = a * b; a /= b; // artinya -> a = a / b; a %= b; // artinya -> a = a % b; console.log(a);