Question

10 + 20 = 20 + x

Answer 1

30=20+x

x=30-20

x=10

Answer 2

10 + 20 = 20 + x

30 = 20 + x 

x = 30 - 20

x = 10

k mìh nha

Answer 3

10+20=20+x

30=20+x

x=30-20

x=10

Answer 4

10 + 20 = 20 + x

30 = 20 + x

x = 30 -20 

x = 10

vậy x sẽ là = 10