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Is this answer is right?
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Is this answer is right?

Is this answer is right?-example-1
User Bussiere
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\bf \cfrac{7y-x}{z}~~ \begin{cases} x=9\\ y=5\\ z=4 \end{cases}\implies \cfrac{7(5)-9}{4}\implies \cfrac{35-9}{4}\implies \cfrac{26}{4}\implies \cfrac{13}{2}\implies 6(1)/(2)

User RickNZ
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