2x + 3x +4y-8y +8z +9x - 4z
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2x + 3x +4y-8y +8z +9x - 4z ⇒
2x + 3x + 9x + 4y -8y + 8z -4z ⇒
14x - 4y + 4z
Answer : Hence , your answer is 14x - 4y + 4z
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