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(x+y)/9+(x-y)/3=x+4
x/2-y/3+2=0 /*6
(x+y)/9+(x-y)/3=x+4 /*9
3x-2y+12=0
x+y+3x-3y=9x+36
3x-2y+12=0
-5x-2y=36 /*-1
3x-2y+12=0
5x+2y=-36
8x=-48 /:8
x =-6
5*(-6)+2y=-36
2y=-36+30
2y=-6
y = -3
x = -6
y = -3