Explications étape par étape:
A = 3x + 11 > x + 0,5
A = 3x - x > 11 - 0,5
A = 2x > -10,5
X = - 5,25
S = [ - 5,25 + infini]
B = 2/3x + 8/7 < 4x + 1
B = 14x + 24 < 84x + 21
B = 14x - 84x < 21 - 24
B = - 70x < - 3
X = 3/70
S = [ 3/70 + infini]
C = 12y + 7 < 8 + y / 3
C = 37y < - 13
Y = -13/37
S = [ - infini - 13/37]