Tìm x: 23 + x = 62 x - 37 = 16 x + 46 = 81 x - 53 = 19

a)  23 + x= 62
x= 62 – 23
x= 39

b) x + 46= 81
x= 81 – 46
x= 35

c) x - 37= 16
x= 16 + 37
x= 53

d) x – 53= 19
x= 19 + 53
x= 72