Sagot :
bonjour
5 x + 7 = 2 x - 2
5 x - 2 x = - 2 - 7
3 x = - 9
x = - 9/3 = - 3
3 x + 2 = x - 10
3 x - x = - 10 - 2
2 x = - 12
x = - 12/2 = - 6
2 x - 5 = 5 x + 1
2 x- 5 x = 1 + 5
- 3 x = 6
x = - 6/3 = - 2
3 - 7 x = 3 x + 2
- 7 x - 3 x = 2 - 3
- 10 x = - 1
x = - 1/-10 = 1 /10
Réponse :
Bonjour,
a)5x+7=2x-2
5x+7= 2x-2
5x-2x= -2-7
3x= -9
x= -3
b) 3x+2=x-10
3x+2= 1x-10
3x-1x= -10-2
2x= -12
x= -6
c) 2x-5=5x+1
2x-5= 5x+1
2x-5x= 1+5
-3x= 6
x= -2
d)3-7x= 3x+2
-7x+3= 3x+2
-7x-3x= 2-3
-10x= -1
x= 1/10
x= 0,1