30 POINTS, and BRAINLIEST, solve this equation, URGENT

X = 31/34

Here is how I solved this problem.
I hope this helps.

8(x-3)+7 = 2x(4-17)
8x-24+7=2x(-13)
8x-31 = -26x
8x = -26x+31
34x= 31
34x/34 = 31/34
X= 31/34

Best answer that i found on yahoo ok   set :   x= length of 2nd piece in cm  x- 3= length of 1st piece in cm  x-4= length of 3rd piece in cm  then since you know they all came from the 20 cm ribbon you add them together and set them equal to 20x+ x-3 +x-4 = 20  3x - 7= 20  3x= 27  x= 9  the shortest piece is the third piece which is x- 4  x-4  9-4 = 5  the length of the smallest piece is 5 cm.  the other lengths are  9 cm  6 cm