Answer:
x= 15
Explanation:
All sides of a rhombus are equal so AD = CD
2x+10 = 4x-20
Subtract 2x from each side
2x+10-2x = 4x-20 -2x
10 = 2x-20
Add 20 to each side
10+20 = 2x-20+20
30 = 2x
Divide by 2
30/2 = 2x/2
15 =x
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