If 8 is subtracted from seven times a certain number, the result is the same as if 28 is added to three times the number. Find the number.

-2

Step-by-step explanation:

Sol`n:

       A/C to the question,

 A certain number be x,

Then,

          8-7x=28+3

      or,8-28=3x+7x

      or,-20=10x

       or,-20/10=10x

       or,-2=x

       or, x=-2

    Therefore , The number is -2.