x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
x+ 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
ai k mk mk k lại
x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
tk mk mk tk lại
x+30=40x2
x+30=80
x =80-30
x =50
tk mk nha mk tk bạn rùi đó
x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50
x + 30 = 40 x 2
x + 30 = 80
x = 80 - 30
x = 50