3/8х+25=100,1/9х-20=56,40-3/8х=35 1/2,28+4/5х=32
1)3/8х+25=100 3/8х=100-25 3/8х=75 х=75:3/8 х=200 2)1/9х-20=56 1/9х=56+20 1/9х=76 х=76:1/9 х=684