Philip P. answered 04/17/15
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(5/2x) + (3y/3x2)
= (5/2x) + (y/x2)
Put the terms over a common denominator (2x2):
= (5/2x)(x/x) + (y/x2)(2/2)
= (5x/2x2) + (2y/2x2)
= (5x+2y)/2x2