{7x+y/3 - 5x-y/2 = x+y/6 { 9x-2y/8 + 7x+4y/6 = x+y/3 + 4.

{ 7x+y/3 - 5x-y/2 = x+y/6|*6
{ 9x-2y/8 + 7x+4y/6 = x+y/3 + 4.|*24
{42x+2y-30x-3y=6x+y
{216x-6y+168x+16y=24x+8y
{42x+2y-30x-3y-6x-y=0
{216x-6y+168x+16y-24x-8y=0
+{6x-2y=0
+{360x+2y=0
366x=0|:366
x=0
0*6-2y=0
-2y=0|:(-2)
y=0