Ta có:
6 . x - 5 = 613
6x = 618
x = 618 : 6
x = 103
b) 12 . ( x - 1 ) = 0
=> x - 1 = 0
x = 1
6 .x -5 = 613 12 . (x-1) = 0
6 . x = 613 + 5 x - 1 = 0 : 12
6 . x = 618 x - 1 = 0
x = 618 : 6 => x = 1
x =103
6 . x - 5 = 613
6 . x = 613 + 5
6 . x = 618
x = 618 : 6
x = 103
12 . (x-1) = 0
x-1 = 0 : 12
x-1 = 0
x = 0+1
x = 1