3x^2-8x+13=(x-5)^2
(x+1)^2=(x-2)^2
(х-10)^2=(1-x)^2
х+х/3=8
х+1-5(х-5)(5-х)+5
х/2+х/4=-3/2
(х/2)+(х/4)+х=-49/4
6-(х/3)=х/7
(13+х)/4=х+1
(2х-1)/3-3=4х
х-(х/3)=1/2
