Bonjour,
Voilà la réponse
a) 4 + x = -7
a) x = -7 - 4
a) x= -11
b) x- 2 = 11
b) x = 11+2
b) x =13
c) -5 + t = 13
c) y = 13 + 5
c) y = 18
d) -6 + z = -12.5
d) z = -12.5 + 6
d) z = -6.5
e) x + 2/3 = 4
e) x = 4/1 - 2/3
e) x= 12/3 - 2/3
e) x = 10/3
f) 8 + x = 25/7
f) x = 25/7 - 8/1
f) x = 25/7 - 56/7
f) x = -31/7