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=> (6xy + 3yz + 42) + (2xy + 4yz - 4z)
=> 8xy + 7yz - 4z + 42
2.) 5p + 8y - 6 dan 3p - 8y + 4
=> (5p + 8y - 6) + (3p - 8y + 4)
=> 8p - 2