804 - x : 7= 698 tim x
804 - x : 7 = 698
x : 7 = 804 - 698
x : 7 = 106
x = 106 x 7
x = 742
804-x:7=698
x:7 =804-698
x:7 =106
x =106x7
x =742 k cho mik nhé