bjr
a)
x * (7/3) = 2
x = 2/(7/3)
x = 2*(3/7)
x = 6/7
b)
x*(7/3) = -5
x = -5/(7/3)
x = -5*(3/7)
x = -15/7
c)
x*(7/3) = 1/3
x = (1/3)*(3/7) = 1/7
d)
x*(7/3) = 28/9
x = (28/9) / (7/3)
x = (28/9) * (3/7) on simplifie par 3
x = (28/3) * (1/7) on simplifie par 4
x = (4/3) *(1/1) = 4/3
