3x/5-2y=5|×(5)
x-3y/2=6,5|×(2)
3x-10y=25
2x-3y=13
x=25-10y/3
50-20y/3-3y=13|×(3)
50-20y-9y=39
-29y=39-50
-29y=-21
y=21/29
x=25-10×21/29
3
x=25-10×21/29×7
x=25-10×3/29
x=25-30/29
x=725-30/29
x=695/29
