x+800=1000+800
x+800=1800
x=1800-800
c=1000
x + 800 = 1000 + 800
x + 800 = 1800
x = 1800 - 800
x = 1000
x + 800 = 1000 + 800
x + 800 = 1800
x = 1800 - 800
x = 1000
x + 800 = 1000 + 800
x + 800 = 1800
x = 1800 - 800
x = 1000
x + 800 = 1000 + 800
x + 800 = 1800
x = 1800 - 800
x = 1000
x + 800 = 1000 + 800
x + 800 = 1800
x = 1800 - 800
x = 1000
tk mk mk mơn nhìu ^_^
x + 800 = 1000 + 800
x + 800 = 1800
x = 1800 - 800
x = 1000
tk mk mk tk lại
x+ 800 = 1000 + 800
=> x= 1000
đáp số x= 1000
h nha