Bonsoir !
31 - x = 20 + x
× = 1
31 - 1 = 20 + 1
faux
x = 2
31-2 = 20+2
x = 3
31-3 = 20+3
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Bonsoir !
31 - x = 20 + x
× = 1
31 - 1 = 20 + 1
faux
x = 2
31-2 = 20+2
faux
x = 3
31-3 = 20+3
faux