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x = 3 and x = -3
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(1-x²)/(1+x²) = -4/5
5(1-x²) = -4(1+x²)
5 - 5x² = -4 - 4x²
9 = x²
x= √9
x = ±3
that is,
value of x is,
x = 3 (or) x = -3