500 + x = 600 + 300
500 + x = 900
x = 900 - 500
x = 400
500 + x = 600 + 300
500 + x = 900
x = 900 - 500
x = 400
500+x=600+300
500+x=900
x=900-500
x=600
Mik k bạn rùi nha, k mình nhé!
500 + x = 600 + 300
500 + x = 900
x = 900 - 500
x = 400
500 + x = 600 + 300
500 + x = 900
x = 900 - 500
x = 400