bonsoir

[4 ( x ( - 4 ) - ( 5 / -3 ) ]  = - 5 /- 4 [ ( - 4 /- 5 - ( - 4 x ) ]

[ 4 ( - 4 x + 5/3 ) ] =  5/4 ( 4/5 + 4 x )

- 16 x + 20 /3   = 20/20 + 20 x / 4

- 16 x + 20 /3 =  1 + 5 x

- 16 x - 5 x =  1 - 20 /3

- 21 x =  3/3 - 20 /3

- 21 x = - 17 /3

- 63 x /3 = - 17 /3

- 63 x = - 17

x = 17/63

4 ( 17/63 * - 4  + 5/3 ) = 5/4 ( 4/5 + 68/63)

4 (  - 68/63 + 5 /3 ) =  20/20 + 340 / 252

- 272/63 + 20 /3 = 20/20 + 340/252

- 1 088/252 + 1 680 /252 =  1 + 340/252

592 /252 =  252 /252 + 340 /252

592 /252 =  592 /252