Sagot :
7x+5=47
7x+5-5=47-5
7x=42
7x/7=42/7
x=6
-4x+2=18
-4x+2-2=18-2
-4x=16
4x=16
4x/4=16/4
x=4
6x-9=21
6x-9+9=21+9
6x=30
6x/6=30/6
x=5
-2x-8=2
-2x-8+8=2+8
-2x=10
2x=10
2x/2=10/2
x=5
9x+3=7x-11
9x-7x+3=7x-11-7x
2x+3=-11
2x+3-3=-11-3
2x=-14
2x/2=-17/2
x=-7
VOIIIIILA !!!!!!
7x + 5 = 47
=47-5
=42
=42/7
=6
=7x6 + 5
=47
-4x + 2 = 18
=18-2
=16
=16/(-4)
= -4
=-4x(-4) + 2
=18
6x -9 = 21
=21+9
=30
=30/6
=5
=6x5 -9
-2x - 8 = 2
=2+8
=10
=10/(-2)
= -5
=-2x(-5) - 8
=2
je ne trouve pas la dernière réponse désolé.