100 + x = 200 + 300
100 + x = 500
x = 500 - 100
x = 400
100+x=200+300
100+x=500
x=500-100
x=400
100 + x = 200 + 300
100 + x = 500
x = 500 - 100
x = 400
k nha
100-x=200+300
100-x=500
x=500-100
x=400
100 + x = 200 + 300
100 + x = 500
x = 500 -100
x = 400
100 + x = 200 + 300
100 + x = 500
x = 500 - 100
x = 400