1000-х=35+6×8
81÷у=63÷7
х×8=100-(4×9)

1000-х=35+6×8

1000 - x = 35 + 48

1000 - x = 83

x = 1000 - 83

x = 917

81÷у=63÷7

81 : y = 9

y = 81 : 9

y =  9

х×8=100-(4×9)

x * 8 = 100 - 36

8x = 64

x = 64 : 8

x = 8