Bonjour,
A) 5 + x = 2
x= 2-5
x= -3
E) n - 6 = - 7
n= -7+6
n= -1
B) y + 3 = 15
y= 15-3
y=12
F) 4 = t - 7
4+7 = t
t= 11
C) 5 - x = 2
5-2 = x
x= 3
G) x - 2/3 = 6
x= 6 +2/3
x= 18/3 +2/3
x= 20/3
D) - x - 4 = 8
-4 -8 = x
x= -12
H) v + 3/7 = 1/14
v= 1/14 -3/7
v= 1/14 - 6/14
v= -5/14