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( 6p - 5q - 2r ) + ( - 8p + 6q + 9r )
6p - 5q - 2r - 8p + 6q + 9r
- 2p + q + 7r
2p - q - 7r
di kurang
( 6p - 5q - 2r ) - ( - 8p + 6q + 9r )
6p - 5q - 2r + 8p - 6q - 9r
14p - 11p - 11r