I believe x=25. If you look at the sides and what x is multiplied by. You could see that 2x+20 would be one side, which means 50+20 is that side so 70. then 3x-5 would be 70. and so on. You can understand from there on out.
Hope this helps.
All sides are the same, so:
4x - 30 = 2x + 20
2x = 50
x = 25
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