Aidez moi !!!! Urgent a) 2x - 7 = 3x - 9 b) 5 ( x+3 ) - ( x-4) = 4x - 6 c) 2x - 7 = 3x + 5 4           3

Bonsoir,

[tex]a)\ 2x - 7 = 3x - 9\\2x-3x = - 9+7\\-x=-2\\\boxed{x=2}\\\\b)\ b) 5 ( x+3 ) - ( x-4) = 4x - 6\\5x+15 - x+4 = 4x - 6\\5x- x -4x= - 6-15+4\\0x=-17\\\acute{e}quation\ impossible\\pas\ de\ solution.[/tex]

[tex]c)\ \dfrac{2x-7}{4}=\dfrac{3x+5}{3}\\\\\dfrac{3\times(2x-7)}{3\times4}=\dfrac{4\times(3x+5)}{4\times3}\\\\\dfrac{6x-21}{12}=\dfrac{12x+20}{12}\\\\6x-21=12x+20\\\\6x-12x=20+21\\\\-6x=41\\\\x=\dfrac{41}{-6}\\\\\boxed{x=-\dfrac{41}{6}}[/tex]