x-300=500+100
x-300=600
x=600+300
x=900
x-300=500+100
x-300=600
x =600-300
x =300
x - 300 = 500 + 100
x - 300 = 600
x = 600 + 300
x = 900
Vậy x = 900
x - 300 = 500 + 100
x - 300 = 600
x = 600 - 300
x = 300
x - 300 = 500 + 100
X - 300 = 600
X = 600 - 300
X = 300