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(5x+7y+9z)(8y+11z-3x)+(7xy+9zy+8yx+6xz+3yz)+(6xyz+7yzx+4zxy)
On multiplying = 40xy + 55xz -15x² +56y² +77yz - 21xy + 72yz+ 99z² - 27xz +7xy + 9yz + 8yx +6xz+3yz + 6xyz+ 7yzx + 4zxy = - 15x² + 56 y² +99z² + 34xy + 161 yz +34 xz + 17 xyz. Hope it helps
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