we first need to bring both fractions to the same denominator, so we will multiply the first one by x+4. (because (x-4)(x+4)=x^2-16) (x-6)(x+4)/(x^2-16) + 16/(x^2-16)=0 (x-6)(x+4)+16=0 (if a fraction is equal to 0, the numerator...
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