1.)2x-5/x+5 + 3x+4/x+2 - 1=0
(x+2)(2x-5)+(x+5)(3x+4)-(x+5)(x+2)/(x+5)(x+2)
2x^2-5x+4x-10+3x^2+4x+15x+20-(x^2+2x+5x+10)/(x+5)(x+2)
2x^2-5x+4x-10+3x^2+4x+15x+20-x^2-7x-10/(x+5)(x+2)
4x^2+11x+0/(x+5)(x+2)
4x^2+11x/(x+5)(x+2)
4x^2+11x=0
x(4x+11)=0
x=0
4x+11=0
x1=-11/4
x2=0
3.)делаем подстановку t=4-3x/x+1
t+1/t=50/7
t=1/7
t=7
4-3x/x+1=7
x=27/22
x=-3/10
