Add 4x + 6y + 3z, ( -6x -5y +7z) and (9x +5y -11z) *
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4x+6y+3z+(-6x-5y+7z)+9x+5y-11z
4x+6y+3z-6x-5y+7z+9x+5y-11z
4x-6x+9x+6y-5y+5y+3z+7z-11z
7x+5y-z
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