book Maths Puzzle Numerical Ability

Please show me how to work this.
x+5/-1

What values for x must be excluded? The answer is none, but I cant figure it out!

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book Other Question

Divide.
1) -15xy - 10x
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5x

2) 2x2y - 6xy2 + 12xy
--------------------
2xy
May I please have some help? A soccer field is 336yd^2. The width is 5yd longer than its length. What is the length and width of the soccer field. Thanks for your help.