solve the equation:x^2-1/x^2+1=4/5
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Answer:
x^2-1/x^2+1=4/5
=>(x^2-1)×5=(x^2+1)×4
=>5x^2-5=4x^2+4
=>5x^2-4x^2=4+5
=>x^2=9
=>x=3
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