k += 5 => k = k + 5 w -= 10 => w = w - 10 x *= b => x = x * b y /= a+b => y = y / (a+b) n %= 10 => x = x % 10 (also <<, >>, &, ^, | operators)In general, these take the form
<Lvalue> <op>= <expression> equivalent to <Lvalue> = <Lvalue> <op> ( <expression> )