21/14-1 2/3x=1 5/21 решить уравнение

2 1/14 - 1 2/3х = 1 5/21
1 2/3х = 2 1/14 - 1 5/21
1 2/3х = 2 3/42 - 1 10/42 = 1 45/42 - 1 10/42 = 35/42 = 5/6
1 2/3х = 5/6
5/3х = 5/6
х = 5/6 : 5/3 = 5/6 * 3/5 = 3/6
х = 3/6 = 1/2 = 0,5.