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1) 2x - 5x + 9x2) 2x + 7x + x – 8x 3) 5xy – 3x + 4xy 4) 6x – 8y – 4y5) 3y + 5y – 7y + x6) 8z + 3xy – 12z7) 5m – 9n + 2n8) 10x + 4y – y9) 6z – 4z + 2z10) 3x – 7y + 5x + 4y:)