8[3 - 4(x - 2) + 4(x - 7)]

8[3 - 4(x - 2) + 4(x - 7)]  =

8[ 3  - 4x + 8 + 4x - 28 ]  =     simplify inside the brackets

8 [ -17]  =

-136

Sorry, young person: There is NO SOLUTION to your problem the way you have written. Check it carefully and see if you have missed something!. Thanks.