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

what is x and how do you do it
1/2x+1/3x=8
yahnk you soooooooooooooooooooooooooooooooooo much It takes Kathy 3 hours and 40 minutes to clean the kitchen of her house. Find her work rate of the job per hour. Your answer is supposed to be a fraction. Put the the answer in the answer box.