Sagot :
Bonjour,
5) 3 x+4=−7−2 x
3x + 2x = - 7 - 4
5x = - 11
x = - 11/5
6) 3x+4=4x–1
3x - 4x = - 1 - 4
- 7x = - 5
x = 5/7
7) 13 x−30=7 x – 14
13x - 7x = - 14 + 30
6x = 16
x = 16/6
x = 8/3
8) 2(x+1)+3(x−1)=0
2x + 2 + 3x - 3 = 0
2x + 3x = - 2 + 3
5x = 1
x = 1/5.