1)
(2y+3)/(2y-1)=(y-5)/(y+3) / *(y+3)(2y-1)
(2y+3)(y+3)=(y-5)(2y-1)
2y^2+6y+3y+9=2y^2-y-10y+5
20y=-4
y=-0.2
2)
(5y+1)/(y+1)=(y+2)/y / *y(y+1)
y(5y+1)=(y+2)(y+1)
5y^2+y=y^2+y+2y+2
4y^2-2y-2=0
2y^2-y-1=0
D=1+8=9
y1=(1+9)/4
y1=2.5
y2=(1-9)/4
y2=-2
3)
(x-3)/(x-5)+1/x=(x+5)/x(x-5) / *x(x-5)
x(x-3)+(x-5)=x+5
x^2-3x+x-5-x-5=0
x^2-3x-10=0
D=9+40=49
x1=(3+7)/2
x1=5
x2=(3-7)/2
x2=-2