27*125*8 (49-6*x) = 27000 (2*10+8*10) - (2*x+6) = 6*15-9*5

Первое уравнение:

27 * 125 * 8 (49 - 6x) = 27 000;

27 * 125 * 392 - 48x = 27 000;

27 * 125 * 392 - 48x = 27 000;

3 375 * 392 - 48x = 27 000;

1 323 000 - 48x = 27 000;

-48x = 27 000 - 1 323 000;

-48x = - 1 296 000;

х = - 1 296 000 : (-48);

х = 27 000;

Второе уравнение:

(2 * 10 + 8 * 10) - (2x + 6) = 6 * 15 - 9 * 5;

(20 + 80) - (2x + 6) = 6 * 15 - 9 * 5;

(20 + 80) - (2x + 6) = 90 - 45;

(20 + 80) - (2x + 6) = 45;

100 - (2x + 6) = 45;

100 - 2x - 6 = 45;

-2x = 45 - 100 + 6;

-2x = - 49;

х = - 49 : (-2);

х = 24,5.