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MATH / Find the coefficient of x when (7+8x)−3(2+6x+2x²)+9(1+3x+4x²+12x³)−9(7−x²−8x³+13x⁴) is simplified. · Discussion

Discussing Find the coefficient of x when (7+8x)−3(2+6x+2x²)+9(1+3x+4x²+12x³)−9(7−x²−8x³+13x⁴) is simplified. · MATH

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