3/5=4/(y-3)
(x+4)/6=5/4
4x+5y=5
8x+5y=25
6x+3y=-6
2x-3y=14
$\sqrt{80}$
8000 /0.75
$\sqrt{18}$
$\sqrt{8}$
10/(x-2)=6/(x-4)
-20/x=-30/(x+2)
