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3x +3y -2x -4=7
2x +3y =13
x +3y = 11
2x+3y=13
x=11-3y
2(11-3y)+3y=13
x=11-3y
22-6y+3y=13
x=11-3y
-3y=-9 /:(-3)
x=11-3y
y=3
x=11-9
y=3
x=2
{3(x+y)-2(x+2)=7
{2x-2+3y-6=5
{3x+3y-2x-4=7
{2x+3y=5+8
{X+3y=7+4
{2x+3y=13
{x+3y=11 / *(-1)
{2x+3y=13
{-x-3y=-11
X=2
2x+3y=13
2*2+3y=13
4+3y=13
3y=13-4
3y=9 / :(3)
Y=3
{X=2
{Y=3