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Quyidagi ratsional ifodalarni koʻpaytiring va natijani soddalashtiring.
start fraction, 12, y, plus, 8, y, z, divided by, y, start superscript, 4, end superscript, plus, 9, y, cubed, z, plus, 20, y, squared, z, squared, end fraction, dot, start fraction, y, squared, minus, 16, z, squared, divided by, 6, z, plus, 9, end fraction, equals
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