( 2х + 3y)/4 + ( 3x - 4y)/3 = 43/12
( 3x + 4y)/2 - ( 5x - 4y)/5 = - ( 9/5 )
3( 2x + 3y) + 4( 3x - 4y ) = 43
5( 3х + 4y ) - 2( 5x - 4y ) = - 18
6x + 9y + 12x - 16y = 43
15x + 20y - 10x + 8y = - 18
18x - 7y = 43
5x + 28y = - 18
72x - 28y = 172
77x = 154
x = 2
36 - 7y = 43
7y = - 7
y = - 1
Ответ ( 2 ; - 1 )