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8^2-4/72 please help I’m so confused!

8^2-4/72 please help I’m so confused!-example-1

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\cfrac{8^2-4}{72}\implies \cfrac{64-4}{72}\implies \cfrac{60}{72}\implies \cfrac{12\cdot 5}{12\cdot 6}\implies \cfrac{12}{12}\cdot \cfrac{5}{6}\implies 1\cdot \cfrac{5}{6}\implies \cfrac{5}{6}

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