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Question
Solve `x + 4/x = -4; x != 0`
Solution
`x + 4/x = -4`
`=> (x^2 - 4)/x = -4`
`=> x^2 + 4 = -4x`
`=> x^2 + 4x + 4 = 0`
`=> (x + 2)^2 = 0`
=> (x + 2) = 0
=> x = -2
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