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Question

If x1x+1+1=0, then 4x is equal to ____.

A
41
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B
0
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C
5
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D
114
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Solution

The correct option is C 5
We can write it as x1+1=x+1
Squaring both sides we get,
x1+1+2x1=x+1
2x1=1

Squaring both sides, we get
4(x1)=1
4x=5

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