100 + x = 100 + 20
100 + x = 120
x = 120 - 100
x = 20.
100+x=100+20
100+x=120
x=120-100
x=20
k mình nha
100+x=100+20
100+x=120
x=120-100=20
cho mik nha bạn
100 + x = 100 + 20
100 + x = 120
X = 120 - 100
X = 20
100 + x = 100 + 20
100 + x = 120
x = 120 - 100
x = 20