1/2x+5/14-2/21=1 1/21-2 5/7+3/4x

Вычислим корень уравнения.

½ * x + 5/14 - 2/21 = 1 1/21 - 2 5/7 + ¾ * x;

½ * x - ¾ * x = 1 1/21 - 2 5/7 - 5/14 + 2/21;

2/4 * x - ¾ * x = 1 + 3/21 - 2 10/14 - 5/14;

x * (2/4 - ¾) = 1 + 1/7 - 2 - 15/14;

x * (-1/4) = 1 + 1/7 - 2 - 1 1/14;

x * (-1/4) = - 1 + 1/7 - 1 1/14;

-1/4 * x = - 2 + 1/7 - 1/14;

-1/4 * x = - 2 + 2/14 - 1/14;

-1/4 * x = - 2 + 1/14;

-1/4 * x = - 1 - 14/14 + 1/14;

-1/4 * x = - 1 13/14;

¼ * x = 27/14;

½ * x = 27/7;

7 * x = 2 * 27;

x = 54/7;

x = 7 5/7.