bonjour;
moyenne 12
(5*6) +(3*10)+(6*x)
= 30+30+6x
(30+30+6x)/6 = 12
(60+6x) /6= 12
60+6x = 12*6
60+6x = 72
6x = 72-60
6x = 12
x = 12/6
x = 2
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bonjour;
moyenne 12
(5*6) +(3*10)+(6*x)
= 30+30+6x
(30+30+6x)/6 = 12
(60+6x) /6= 12
60+6x = 12*6
60+6x = 72
6x = 72-60
6x = 12
x = 12/6
x = 2