book Maths Puzzle Numerical Ability

please help with this problem: translate the quotient of a number and seven is two into an equation and solve thank-you

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Need help understand these.

2) Is ( square root of x)^2=x an identity (true for all nonnegative values of x)?
Answer:
Explain your answer in this space. im so sorry, i was sick and my teacher was gone when i came back, so left out
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