1.) 35 * (5 а+19) = 30 а+1134 2.) 725t-123t-292=912

Найдем корни уравнений.

1) 35 * (5 * а + 19) = 30 * а + 1 134;

Раскроем скобки.

35 * 5 * a + 35 * 19 = 30 * a + 1 134;

175 * a + 665 = 30 * a + 1 134;

175 * a - 30 * a = 1 134 - 665;

a * (175 - 30) = 469;

a * 145 = 469;

145 * a = 469;

a = 469/145;

Ответ: а = 469/145.

2) 725 * t - 123 * t - 292 = 912;

(725 * t - 123 * t) - 292 = 912;

t * (725 - 123) - 292 = 912;

t * 602 - 292 = 912;

602 * t - 292 = 912;

602 * t = 912 + 292;

602 * t = 1 204;

t = 1 204/602;

t = 2.