Find the roots of the following equations :
(i) `x-1/x=3,x!=0`
(ii) `1/(x+4)-1/(x-7)=(11)/(30), x!=-4,7`

Explanation

### Step-by-Step Solution

#### Part (i): Solve the equation \( x - \frac{1}{x} = 3 \)

1. **Multiply both sides by \( x \)** (to eliminate the fraction):
\[ x^2 - 1 = 3x \]
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