Решите умаляю,пжжжж. Математика

1) 3х + 5 = 7х + 13 3х - 7х = 13 - 5 -4х = 8 х = -2 2) 6х - 13 = 17 - 9х 6х + 9х = 17 + 13 15х = 30 х = 2 3) 1,7 + 2,8 = 1,9х - 1,2 -1,9х = -1,2 - 1,7 - 2,8 -1,9х = -5,6 х = 2,95 4) 5/9х + 17/9 = 2/9х + 7/9 5/9х - 2/9х = 7/9 - 17/9 3/9х = -10/9 х = -10/3 х = -3.1/3 5) 2 (х + 2) - 4 (х - 3) = 5х + 9 2х + 4 - 4х + 12 = 5х + 9 2х - 4х - 5х = 9 - 4 - 12 -7х = -7 х = 1