Question 452679
(xy-zy)/(y)*(xw-xy)/(yz-yw)=
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Factor where you can to get:
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[y(x-z)]/y  * [x(w-y)]/[-y(w+z)]
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Cancel the common y factor to get:
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= (x-z)[x(w-y)]/[-y(w+z)]
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That's as far as you can go.
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Cheers,
Stan H.