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Solve each proportion and find the value of x. Write your answer in the blank.
1. 5:10= 15:x = _____
2. x:12 = 3:12 = _____
3. 25:x = 50:20 = ____
4. 8:3 = 8:x = _____
5. x:4 = 8:16 = ______​