bonjour
x /2 = 4 /3
3 x /6 = 8/6
3 x = 8
x = 8/3
b ) 3 x /5 = 4 /7
21 x /35 = 20/35
21 x = 20
x = 20/21
c ) 5 a/4 = 3 /2
5 a /4 = 6/4
5 a = 6
a = 6/5
d) 3 /( 2 x - 1 ) / 2 = 5 /6
3 / ( 2 x - 1 ) * 1/2 = 5 /6
3 / ( 4 x - 2 ) = 5/6
3 = 5/6 ( 4 x - 2 )
3 = ( 20 x - 10 ) / 6
3 *6 = 20 x - 10
18 + 10 = 20 x
- 20 x = - 28
x = - 28 / - 20 = 28/20 = 7/5
e) 5/ 2x = 5/(4x + 3) / 3
5/2x * 3 = 5/(4x + 3)
15/2x = 5/(4x + 3)
15/2x (4x + 3) = 5
(60x + 45) / 2x = 5
60x + 45 = 10x
60 x - 10 x = - 45
50 x = - 45
x = - 45/50 = - 9/10
