Sagot :
Bonjour,
7x + 17 = 9x + 29
7x - 9x = 29 - 17
-2x = 12
x = -12/2 = -6
4x + 15 = 7x + 24
4x - 7x = 24 - 15
-3x = 9
x = -9/3 = -3
8x + 26 = 5x + 14
8x - 5x = 14 - 26
3x = -12
x = -12/3 = -4
23x + 31 = 16x + 17
23x - 16x = 17 - 31
7x = -14
x = -14/7 = -2
Bonjour,
a) 7x+17=9x+29
17-29=9x-7x
-12=2x
-12/2=x
-6=x
b) 4x+15=7x+24
15-24=7x-4x
-9=3x
-9/3=x
-3=x
c) 8x+26=5x+14
8x-5x=14-26
3x=-12
x=-12/3
x=-4
d) 23x+31=16x+17
23x-16x=17-31
7x= -14
x=-14/7=-2
Bonne journée.
a) 7x+17=9x+29
17-29=9x-7x
-12=2x
-12/2=x
-6=x
b) 4x+15=7x+24
15-24=7x-4x
-9=3x
-9/3=x
-3=x
c) 8x+26=5x+14
8x-5x=14-26
3x=-12
x=-12/3
x=-4
d) 23x+31=16x+17
23x-16x=17-31
7x= -14
x=-14/7=-2
Bonne journée.