Add,6x-5y-2z+9,15y-3x+6z and 6z-3y+5
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6x-5y-2z+9+15y-3x+6z+6z-3y+5
=6x-3x-5y+15y-3y-2z+6z+6z+9+5
=3x+7y+10z+14
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Answer:
the sum of given 3x+7y+10z+13
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