x + 30 = 80
x = 80 - 30
x = 50
k mik nha
x + 30 = 20 + 60
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 20 + 60
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 20 + 60
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 20 + 60
x + 30 = 80
x = 80 - 30
x = 50
k cho mình nhé :}}}}}}}