0,24 (x+300) - 0,94x=163

0,24 * (x + 300) - 0,94 * x = 163;

Раскроем скобки.

0.24 * x + 0.24 * 300 - 0.94 * x = 163;

0.24 * x + 24 * 3 - 0.94 * x = 163;

0.24 * x + 72 - 0.94 * x = 163;

Приведем подобные.

(0,24 * x - 0.94 * x) + 72 = 163;

x * (0.24 - 0.94) + 72 = 163;

x * (-0.7) + 72 = 163;

-0.7 * x + 72 = 163;

-0.7 * x = 163 - 72;

-0.7 * x = 91;

x = - 91/0.7;

x = - 910/7;

x = - 700/7 - 210/7;

x = - 100 - 30;

x = - 130.