-x^2+5х+3=-x^2-х+56х=3
3*2х=3
3 сокращаем
2х=1
х=1\2
-у^2+7ху+2x^2
3+5х-x^2=2x+6-x^2-3x
x^2-x^2+5x+3x-2x=6-3
8x=3
x=3/8
4x^2+4xy-2x^2+xy+2xy-y^2=2x^2+7xy-y^2
-x^2+5х+3=-x^2-х+5
6х=3
3*2х=3
3 сокращаем
2х=1
х=1\2
-у^2+7ху+2x^2
3+5х-x^2=2x+6-x^2-3x
x^2-x^2+5x+3x-2x=6-3
8x=3
x=3/8
4x^2+4xy-2x^2+xy+2xy-y^2=2x^2+7xy-y^2