2) x^3 ( y^3 - 2 ) + 5 ( y^3 - 2 ) = (y^3 - 2) (x^3 + 5)
4) 9 ( 3 - x^2 ) + y^6 ( 3 - x^2 ) = (3 - x^2 ) ( 9 +y^6)
(y-6)^2 - 9y=y^2-12y+36-9y=y^2-21y+36
{7x+9y=15 //*5
{8x-5y=4 //*9
{35x+45y=75
+
{72x-45y=36
107x=111
x=111/107=1.03
5y=8*1.03-4
y=4.299/5=0.859
x=1.03
y=0.859
6-13 1/4:1-0.8-9 4/5=-5 1/4