Bonjour,
[tex]4x-8x+24x=144\\-4x+24x=144\\20x=144\\\dfrac{20x}{20} =\dfrac{144}{20} \\x=7,2\\\\16x-20=20x-4\\16x-20+20=20x-4+20\\16x=20x+16\\16x-20x=20x+16-20x\\-4x=16\\\dfrac{-4x}{-4} =\dfrac{16}{-4} \\x=-4\\\\20x+28=32x+52\\20x+28-28=32x+52-28\\20x=32x+24\\20x-32x=32x+24-32x\\-12x=24\\\dfrac{-12x}{-12} =\dfrac{24}{-12} \\x=-2[/tex]
Bonne journée !
