1. (3x-y)/x+2y=2|×(x+2y)
4(x-2)-3(y+5)=-6
3x-y=2x+4y
4x-8-3y-15=-6
x=5y
4*5y-3y=17
x=5y
17y=17
x=5y
y=1
x=5
y=1
2. 3(2x+3)-5(3y-2)=22
(x-3y)/4x-7y=-1 |×(4x-7y)
6x+9-15y+10=22
x-3y=-4x+7y
6x-15y=3
5x=10y
6x-15y=3
x=2y
6*2y-15y=3
x=2y
12y-15y=3
x=2y
-3y=3 |÷(-3)
x=2y
y=-1
x=-2