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tabbycat24816
I believe 8. Let me know if this works!

If you found this especially helpful, I'd appreciate if you'd vote me Brainliest for your answer. I want to be able to assist more users one-on-one!
musiclover10045

To find X set up a ratio of the two top dimensions and the two bottom dimensions first:

5/3 = 40/2x +10

Now cross multiply:

5 * 2x+10 = 3*40

Simplify:

10x +50 = 120

Subtract 50 from each side:

10x = 70

Divide each side by 10:

x = 70/10

x = 7