Bonjour silvouplai pouvez vous maider au 6

a)  4/5 (x-3) = 2/5 x +2
=>4/5 x -12/5 = 2/5 x + 2
=>4/5 x -2/5 x=12/5 +2
=>2/5 x= 22/5
=> x= (22/5)/(2/5)
=> x= 11

b) 1/21 x +2 = 4/21 -4
=>1/21 x =4/21 -6
=> 1/21 x= -122/21
=> x= (-122/21)/(1/21)
=> x= -122

c) x/6+1 =5/6 x-1/6
=>x/6 - 5/6x=-1/6-1
=>x/6 - 5/6 x= -7/6
=>x (1/6-5/6) = -7/6
=>x (-2/3) = -7/6
=>x=(-7/6)/(-2/3)
=>x=7/4