14x+10y-12xy-13'18-7x-10y+8xy'4xy
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14x-7x+10y-10y-12xy+8xy+4xy-13+18
✒ 14x-7x+10y-10y-12xy+8xy+4xy-13+18
✒ =7x+0-0+5
✒ =7x+5
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