Question

Решите умаляю,пжжжж. Математика

Answer 1

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