bonjour
8 x + 12 = 2
8 x = 2 - 12
8 x = -10
x = - 10/8 = - 5/4
9 x + 7 = - 12
9 x = - 12 - 7
9 x = - 19
x = - 19/9
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bonjour
8 x + 12 = 2
8 x = 2 - 12
8 x = -10
x = - 10/8 = - 5/4
9 x + 7 = - 12
9 x = - 12 - 7
9 x = - 19
x = - 19/9