exam Maths Puzzle Numerical Ability

I cannot figure out the restrictions, i am completely confused!!
6/x+3-5/x-2=-20/x^2+x-6

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A plumber needs 3 times as much solid pipe as perforated pipe to lay a drain line 200 feet long. How much solid pipe is needed? find the domain of the function f(x)= 1
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2
x + 7x - 8