5y-(7-2у)-(4y+8)=2y
5у-7+2у-4у-8=2у
3у-2у=15
у=15
6y(13y-9)-13y(6y-1)=24y-13
78у^2-54y-78y^2+13y=24y-13
-54y+13y-24y=-13
-65y=-13
y=13^65
y=0.2
(2x-3)^2-(2x+1)(2x-5)=3x-14
4x^2-12x+9-(4x^2+2x-10x-5)=3x-14
4x^2-12x+9-4x^2+8x+5=3x-14
-7x=-14-14
-7x=-28
x=28:7
х=4