Résoudre les systèmes d’équation suivants avec la méthode la plus adaptée :
a . {5x + 7y = 8 10x + 21y = 23
d . {12x − 7y = − 6 8x − 4y = 3
b . {4x + y = 12 3y − 7x = − 2
e . {4x − 3y = 9 12y − 16x = 36
c . {4x + y = 9 7x + y = 3
f . {3x + 5y = 8
32 − 12x = 20y
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