4*(2-3x)+7*(6x+1)-9*(9x+4)=30

4 * (2 - 3 * x) + 7 * (6 * x + 1) - 9 * (9 * x + 4) = 30;

4 * 2 - 4 * 3 * x + 7 * 6 * x + 7 * 1 - 9 * 9 * x - 9 * 4 = 30;

8 - 12 * x + 42 * x + 7 - 81 * x - 36 = 30;

-12 * x + 42 * x - 81 * x = 30 + 36 - 7 - 8;

(42 - 81 - 12) * х = 51;

-51 * х = 51;

х = 51/(-51) = -1;

Ответ: х = -1.