$2x + 2y - 4x + 4y =$

$3(m + n) - (2m - n) =$

$5(2n + 1) - (m - n) =$

$2(a - b) + 3(2a - b) =$

$6(a + 2) - (5a - b) + 2b =$

$(3n + b) + (2n - a) - (m + n) =$

$(2a + b) + 5a + 5b + 2b =$