4/5x+1=7/8 ,4x-1/8=3/11, 11/13=8/3x-1.Срочно.

1)4/5 *х+1=7/84/5 *х=-1+7/84/5 *х=-1/8х=-1/8:4/5=(-1/8*5/4)=-5/322)4х-1/8=3/114х=1/8+3/114х=(11+24)/884х=35/88х=35/88:1/4=35/88*4/1=35/223)11/13=8/3 *х -18/3 *х=11/13+18/3 *х =24/13х=24/13:8/3=24/13*3/8=9/13