Bonjour
7x(2x-5)=4x(-2x+9)
14x² - 35x = - 8x² + 36x
14x² + 8x² - 35x - 36x = 0
22x² - 71x = 0
x (22x - 71) = 0
x = 0 ou 22x - 71 = 0
22x = 71
x = 71/22.
