x+200=1000
x=1000-200
x=800
x + 200 = 600 + 400
x + 200 = 1000
x = 1000 - 200
x = 800
x + 200=600+400
x +200 =1000
x =1000-200
x =800
k mik nha bn
x + 200 = 600 + 400
x + 200 = 1 000
=> x = 800.
x + 200 = 600 + 400
x + 200 = 1000
x = 1000 - 200
x = 800
x + 200 = 600 + 400
x + 200 = 1000
x = 1000 -200
x = 800