bonsoir
21 + 1.5 x = 5 x
1.5 x - 5 x = - 21
- 3.5 x = - 21
x = 6
pour 6 séances
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bonsoir
21 + 1.5 x = 5 x
1.5 x - 5 x = - 21
- 3.5 x = - 21
x = 6
pour 6 séances