(2/3)x+(3/4)y=1/2化简得8x+9y=6①
(4/5)x+(5/6)y=7/15 化简得24x+25y=14②
将①式×3得24x+27y=18③
③-②得2y=4
y=2
将y=2带入①式得x=-1.5