Réponse :
Explications étape par étape
Bonjour,
a)
2x = 2+2
2x = 4
x=4/2 = 2
b)
3z = 11+10
3z = 21
z= 21/3 = 7
c)
1=y
d)
5x= -39 -1
5x = -40
x = -40/5 = -8
e)
3z= 9-2
3z = 7
z= 7/3
f)
6+2,3 = y
8,3 = y
g)
7+22 = 3x
29 = 3x
x = 29/3
h)
6z = -11-5
6z = -16
z = -16/6 = -8/3
i)
-9-11,2 = x
-20,2 =x
j)
9,7y = -1,7 +5,7
9,7y = 4
y = 4/9,7