Bonsoir,
A=
11+2x -12 = 2x -1
B=
-6y +12 -2y = -8y +12
C=
7 -32 +8a +a = 9a -25
D=
-15 - +45 -27b = -27b +30
E=
-30 +15z -9+z = 16z -39
F= 12x -24 +12x = 24x -24
