{ 4x-(2-3x)=0 { 7x-2=0
{y=2-3x { y=2-3× {y=2-3×
{x=3,5 {x=3,5
{y=2-(3×3,5) {y=-8,5
(2x-y)(3x+2y)+6y(x+y)=6x^2 +4xy-3xy-2y^2 +6xy+6y^2 =6x^2 +7xy +4y^2