406 + (a-325) = 901 b*18+312=402 800-c/6=786 реши уравнения

406 + (a - 325) = 901;

а - 325 = 901 - 406;

а - 325 = 495;

а = 495 + 325;

а = 820;

406 + (820 - 325) = 901;

406 + 495 = 901;

901 = 901.

b * 18 + 312 = 402;

18b = 402 - 312;

18b = 90;

b = 90 : 18;

b = 5;

5 * 18 + 312 = 402;

90 + 312 = 402;

402 = 402.

800 - c/6 = 786;

-с/6 = 786 - 800;

-с/6 = - 14;

-с = - 14 : 1/6;

-с = - 14 * 6/1;

-с = - 84;

-с * (-1) = - 84 * (-1);

с = 84;

800 - 84/6 = 786;

800 - 14 = 786;

786 = 786.