Réponse :
Explications étape par étape
Bonjour,
1)4x-5=11
4x= 11+5
4x= 16
x= 16/4 = 4
4*4 -5=11
16-5 = 11
2)6x+9=3
6x = 3-9
6x = -6
x= -6/6 = -1
6*-1+9=3
-6 +9 =3
3)3x+12=0
3x= -12
x=-12/3 = -4
3*-4 +12=0
12-12 = 0
4)3x-5=x+1
3x-x =1 +5
2x = 6
x= 6/2 = 3
3*3-5=3+1
9-5= 4
5)7x+5=4x+8
7x-4x = 8 -5
3x= 3
x= 3/3 = 1
7+5=4+8
12 = 12
6)7x-3=2(x-5)
7x-3 = 2x-10
7x-2x = -10+3
5x = -7
x= -7/5