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x^2-16/x-4=x+4

is this true, not true, sometimes true when x=4, always true except when x=4

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John M. | John - Algebra TutorJohn - Algebra Tutor
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x2-16/x-4=x+4
 
factor the top of the fraction
 
---->  (x+4)(x-4)/x-4=x+4
 
the (x-4) terms cancel so we have
 
x+4 = x+4
 
This is always true.