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2x/3 = -4/9

Tu mets sous dénominateur commun

6x = -4
x = -4/6 = - 2/3

4x - 1/7 = 3/14
Idem
56 x - 2 = 3
56x = 3 +2
56x = 5
x = 5/56

2/3x = - 4/9
x = -4/9 x 3/2
x = -12/18
x = - 2/3

4x - 1/7 = 3/14
56/14x - 2/14 = 3/14
56/14x = 3/14 + 2/14
56/14x = 5/14
x = 5/14 x 14/56
x = 70/784
x = 5/56