уравнение:5/7x-3/14x=-2
5/7x-3/14x=-2
10/14х-3/14х=-2
1/2х=-2
х=-2 : 1/2
х=-4
10/14Х - 3\14Х = - 28\14
10Х - 3Х = -28
7Х = - 28
Х = - 4