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(8a)/(7b) * \frac{7a {}^(2) }{ - 2}

User Ashark
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\bf \cfrac{8a}{7b}* \cfrac{7a^2}{-2}\implies \cfrac{8a* 7a^2}{7b* -2}\implies \cfrac{56a^3}{-14b}\implies \cfrac{4a^3}{-1b}\implies -\cfrac{4a^3}{b}

User Teboto
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