I'm not seeing how these two are equivalent: .
Could somebody show/tell me, please?
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We have . In particular, when , we have . In this case, .
Also, these two fractions are equal, not equivalent.
Or (more the same) just multiply both the numerator and the denominator by negative one:
x = 3
-(1 / (3 - 1)) = -(1 / 2) = -1/2
1 / (1 - 3) = 1 / -2 = -1/2
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