Ta có: 9365-x+478 = 6621
9365-x = 6621-478
9365-x = 6143
x = 9365 - 6143
x = 3222
\(9365-x+478=6621\)
\(-x=6621-478-9365\)
\(-x=-3222\)
\(x=3222\)
vậy \(x=3222\)
9365-x+478=6621
9365-x =6621-478
9365-x=6143
x=9365-6143
x=3222
9365-x+478=6621
9365-x =6621-478
9365-x =6143
x =9365-6143
x =3222
9635 - x + 478 = 6621
x + 478 = 9635 - 6621
x + 478 = 3014
x = 3014 - 478
x = 2536