Bonjour. Est ce que vous pourriez m'aider ? il faut donner la valeur des lettres : a) 2x (lettre) - 2 = 2
b) 3z-10 = 11
c) 1-y = 0
d) 1+5x (lettre) = 39
e) 2+3z = 9
f) 6-y=-2.3
g) 7-3x (lettre)= -22
h) 5+6z = -11
i) -x (lettre) -9 = 11.2
j) 9.7y - 5.7 = -1.7

merci d'avance
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