1) 18 + x = 20x = 2
2) 77 - x = 7077 - 70 = x7 = x
3) 64 - 4 = 6060 = 60
4) 29 - 9 > 1920 > 19
5) x - 5 = 10x = 15
1) 18 + x = 20
x = 2
2) 77 - x = 70
77 - 70 = x
7 = x
3) 64 - 4 = 60
60 = 60
4) 29 - 9 > 19
20 > 19
5) x - 5 = 10
x = 15