Salut,
2x = - 7
x = - 7 ÷ 2
x = - 3, 5
______________
- 4x = 12
x = 12 ÷ ( - 4 )
x = - 3
______________
- 3x = 5
x = 5 ÷ ( - 3 )
x = - 1, (6)
______________
- 8x = 0
x = 0 ÷ ( - 8 )
x = 0
______________
- 6x = - 15
x = ( - 15 ) ÷ ( - 6 )
x = 2, 5
______________
14x = - 21
x = ( - 21 ) ÷ 14
x = - 1, 5