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Jumlahkan dengan metode distributif untuk mempermudah:
= (3y² - 2y - 1) + (3y + 5)
= 3y² - 2y - 1 + 3y + 5
= 3y² + (-2y + 3y) + (-1 + 5)
= 3y² + y(-2 + 3) + 4
= 3y² + y(1) + 4
= 3y² + y + 4