А) 5х-9=2,3х+1
5х-2,3х=1+9
2,7х=10
х= 3 19/27
б) 6(х-3)+2(х+2)=1
6х-18+2х+4=1
8х-14=1
8х=1+14
8х=15
х=1 7/8
в) 3(х-9)+5(х-4)=1
3х-27+5х-20=1
8х+47=1
8х=1-47
8х=-46
х=5,75
Y=24/x
(x+1)*(24/x-2)=20
2-2x+24/x=0
x^2-x-12=0
D=1+4*12=49
x=(1+-7)/2
x1=4, x2=-3
y1=24/4=6.
y2=24/(-3)=-8.
ответ (4, 6), (-3, -8).
3,3*10^5...................................................................