x + 300 = 500 - 200
x + 300 = 300
x = 300 - 300
x = 100
ai k mik mik k lại
x + 300 = 500 - 200
x + 300 = 300
x = 300 - 300
x = 0
x+300=500-200
x+300=300
x=300-300
x=0
x + 300 = 500 - 200
x + 300 = 300
x = 300 - 300
x = 0
x+300=500-200
x+300=300
x =300-300
x= =0