What do we get on adding (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+5y-2z+9+15y-3x+6z+6z+6z-3y+5
= 6x-3x+5y+15y-3y-2z+6z+6z+9+5
= 3x + 17y + 1z +14
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