bonsoir svp pouvez vous m'aider avec mes equations ? 2y -4 = -8y +16 5a - 25= 25 4z +7 = 10z -5

bonsoir =)

2y -4 = -8y +16
 2y + 8y = 16 +4
10y = 20
y=20/10
y=2

5a-25=25
5a=50
a=50/5
a=10

4z+7=10z-5
4z-10z=-5-7
-6z=-12
z=-12/-6
z=2

Bonsoir,

2y - 4 = -8y + 16
2y + 8y = 16 + 4
10y = 20
y = 20/10 = 2
 
5a - 25 = 25
5a = 25 + 25
5a = 50
a = 50/5 = 10

4z + 7 = 10z - 5
4z -10z = -5 - 7
-6z = -12
6z = 12
z = 12/6 = 2