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Question

Solve for x, if xx+1+x+1x=3415

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Solution

xx+1+x+1x=3415

x2+(x+1)2x(x+1)=3415

15x2+15(x2+1+2x)=34(x2+x)

15x2+15x2+15+30x=34x2+34x

34x2+34x30x230x15=0

4x2+4x15=0

4x2+10x6x15=0

(2x+5)(2x3)=0

x=52 Or x=32

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