bonjour
je te montre et tu vas essayer de comprendre
5 ( x - 4) = 3 ( x - 2)
5 x - 20 = 3 x - 6
5 x - 3 x = - 6 + 20
2 x = 14
x = 7
x + 4 = 7
x = 7 - 4
x = 3
x/2 = 3
x = 6
x/5 = 1/2
2 x = 5
x = 5/2
x/2 + x /3 + x /4 = 13/5
6 x /12 + 4 x /12 + 3 x /12 = 13/5
13 x /12 = 13/5
65 x /60 = 156/60
65 x = 156
x = 156/65 = 12/5
(x - 1)/4 + ( x - 2)/3 = ( x - 3)/4
(3 x - 3)/12 + ( 4 x - 8)/12 = ( 3 x - 9)/12
3 x - 3 + 4 x - 8 = 3 x - 9
3 x + 4 x - 3 x = - 9 + 3 + 8
4 x = - 2
x = - 2/4 = - 1/2
essaies de finir
