7х - 5 * (2х + 1) = 5х + 15
7х - 10х - 5 = 5х + 15
- 3х - 5х = 15 + 5
- 8х = 20
х = 20 : (- 8)
х = - 2,5
7х - 5 * (2х + 1) = 5х + 15
7х - 10х - 5 = 5х + 15
- 3х - 5х = 15 + 5
- 8х = 20
х = 20 : (- 8)
х = - 2,5