（3x+2y）/4=x+（3/4）y=3(x-2)+y,
化简得{x=-y,
{2x+y/4=6.
解得x=24/7,y=-24/7.方程列出来给我，我看不懂（3x+2y）/4=x+（3/4）y，①x+（3/4）y=3(x-2)+y.②由①，3x+2y=4x+3y,y=-x,由②，2x+y/4=6.解得x=24/7,y=-24/7.