bonjour
a) x - 5/4 = 4 /3
12 x /12 - 15/12 = 16/12
12 x = 16 + 15
12 x = 31
x = 31/12
b ) x + 7/3 = 5/7
21 x /21 + 49/21 = 15/21
21 x = 15 - 49
21 x = - 34
x = - 34/21
c ) x - 5/8 = 3/12
24 x /24 - 15/24 = 6/24
24 x = 6 + 15
24 x = 21
x =21/24 = 7 /8
d) 1/3 - x = - 2/9
3/9 - 9 x / 9 = - 2 /9
- 9 x = - 2 - 3
- 9 x = - 5
x = 5 /9
e ) 5/18 - x = 11/45
25 /90 - 90 x /90 = 22/90
- 90 x= 22 - 25
- 90 x = - 3
x = - 1 /30
f ) x - 12/25 = - 11/15
75 x /75 - 36/75 = - 55/75
75 x = - 55 + 36
75 x = - 19
x = - 19/75
