63 ÷ (5х - 3х - 1) = 21 ÷ 3
63 ÷ (5х - 3х - 1) = 7
63 ÷ (2х - 1) = 7
63 / 2х - 1 = 7
63 = 7(2х - 1)
9 = 2х - 1
- 2х = -1 -9
- 2х = -10
х = 5
40 - 3(х + 2) = 10
40 - 3х + 2 = 10
34 - 3х = 10
- 3х = 10 - 34
- 3х = - 24
х= 8
63 ÷ (5х - 3х - 1) = 21 ÷ 3
63 ÷ (5х - 3х - 1) = 7
63 ÷ (2х - 1) = 7
63 / 2х - 1 = 7
63 = 7(2х - 1)
9 = 2х - 1
- 2х = -1 -9
- 2х = -10
х = 5
40 - 3(х + 2) = 10
40 - 3х + 2 = 10
34 - 3х = 10
- 3х = 10 - 34
- 3х = - 24
х= 8