book Maths Puzzle Numerical Ability

solve listing any restrictions
x/x^2+5x-14 +2/x-2 =1/x+7

does x = -8

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book Other Question

Radical expressions
Three students were asked to simplify sqrt10 +sqrt50. Their answers were:
Sqrt10(1+sqrt5),
Sqrt10+5sqrt2, and
Sqrt2(5+sqrt5).
Which if any is correct?
Which is in simplest form?
Thanks so much x+4+4y+1+2z