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Change the w-3/w+5 fraction into an equivalent fraction with the denominator w2 + w – 20

User Umeka
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(w-3)/(w+5)=((w-3)(w-4))/((w+5)(w-4))=(w^2-4w-3w+12)/(w^2+5w-4w-20)=(w^2-7w+12)/(w^2+w-20)
User Eldrad
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