1000-x=35+6*8 81:y=63:7 x•8=100-(4•9)

1000-х = 35+6×81000-х = 35+481000-х = 83х = 1000-83х = 91781:у = 63:781:у = 9у = 81:9у = 9х×8 = 100-(4×9)х×8 = 100-36х×8 = 64х = 64:8х = 8