Répondre :
bonjour,
execice 1
4x + 7(2x-9)=3x-(10-4x)
4x + 14x - 63 = 3x - 10 + 4x
4x + 14x - 3x - 4x = 63 - 10
15x = 53
x = 53/15
15(2y - 4) + y(5y + 10) = 5y² + 10 (4y -6)
30y - 60 + 5y² + 10y = 5y² + 40y - 60
30y + 5y² + 10y -5y² - 40y = -60 + 60
40y - 40y = 0
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