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Perform the indicated operation

Perform the indicated operation-example-1
User Rafalotufo
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(z^(2)-y^(2))/(a^(2)-b^(2)) : (z+y)/(a-b) =((z-y)(z+y))/((a-b)(a+b))* (a-b)/(z+y) = (z-y)/(a+b)
User Slaven Tomac
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