5(3-2у)-4(9-у)=3(у+5)14(2х-3)-5(х+4)=2(3х+5)+5х9(3х-7)+3(8х-11)=3(9х+8)6(7х-11)-13(х-6)=14(2х+1)

5 * (3 - 2у) - 4 * (9  -у) = 3 * (у + 5) * 14 * (2х - 3) - 5(х + 4) = 2 * (3х + 5) + 5х * 9 * (3х - 7) + 3 * (8х - 11) = 3 * (9х + 8) * 6 * (7х - 11) - 13 * (х - 6) = 14 * (2х + 1)

15 - 10y - 36 + 4y = (3y + 15) * (28x - 42) - 5x - 20 = 6x + 10 + 45x * (3x - 7) + 24x - 33 = (27x + 24) * (42x - 66) - 13x + 78 = 28x + 14

-21 - 6y = 84xy + 420x - 126y - 630 - 5x - 20 = 6x + 10 + 135x^2 - 315x + 24x - 33 = 1134x^2 - 1782x + 1008x - 1584 - 13x + 78 = 28x + 14

- 21 - 6y = 84xy + 415x - 126y - 650 = 135x^2 - 285x - 23 = 1134x^2 - 787x - 1506 = 28x + 14

Перенесем все безызвестные в левую часть уравнения.

120y - 84xy - 115x - 999x^2 = 886