Answer:
x = 15
Step-by-step explanation:
Create the proportion: 5/7 = x/21
Multiply both sides by 21: 15 = x
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There aren't any solutions.
Answer: 3.9
explanation: It's right
Add the two ends together and divide by 2:
50 + 60 = 110
110/2 = 55
The midpoint is 55
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