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
