2x+7/8=7/8 2x=0 x=0 （2/3+1/4)x=11/12 (8+3)x/12=11/12 11/12x=11/12 x=1 x－3/5=1－1/5 x=1-1/5+3/5 x=1+2/5 x=7/5
