Ответ:
(-1;2)
Объяснение:
(4x+14y)/4+(6x-4y)/3=4/3
(6x+4y)/2-(8x-12y)/7=78/14
(12x+42y)/12+(24x-16y)/12=16/12
(42x+28y)/14-(16x+24y)/14=78/14
(12x+42y+24x-16y)/12=16/12
(42x+28y-16x+24y)/14=78/14
(36x+26y)/12=16/12
(26x+52y)/14=78/14
36x+26y=16 *2
26x+52y=78
72x+52y=32
26x+52y=78
46x=-46
x=-1
36*(-1)+26y=16
-36+26y=16
26y=16+36
26y=52
y=2