( 4x + 6y - 9z ) + ( 15x - 6y - 9z) + (7y - 18z)
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4x + 6y - 9z + 15x - 6y - 9z + 7y - 18z
( 4x + 15x ) + ( 6y - 6y + 7y ) + ( - 9z - 9z - 18z )
= 19x + 7y - 36z
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