algebra, adding rational expressions
posted by Armelia .
2/zy^2+7/z^2y

algebra, adding rational expressions 
Damon
(z/z)(2/zy^2) = 2z/z^2y^2
(y/y)(7/z^2y) = 7y/z^2y^2
sum = (2z+7y)/z^2y^2
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