add the following monomials _2xy,7xy,15xy,_10xy,xy,_xy
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-2xy+7xy+15xy-10xy+xy-xy=10xy
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= - 2xy + 7xy + 15xy - 10xy+ xy - xy
= - 2xy -1 0xy - xy + 7xy + 15xy + xy
= - 12xy - xy + 22xy + xy
= - 13xy + 23xy
= 10xy
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