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Add the algebraic expressions: (11)/2x ...

Add the algebraic expressions: `(11)/2x y+(12)/5y+(13)/7x ,\ -(11)/2y-(12)/5x-13\ x y`

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`(11)/2x y+(12)/5y+(13)/7x ,\ -(11)/2y-(12)/5x-13\ x y`
`(11)/2x y+(12)/5y+(13)/7x +( -(11)/2y-(12)/5x-13\ x y)`
`=(-15/2)xy-(31/10)y-(19/35)x`
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