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2 possible meanings:

(5k)2/7=2 or 5k2/7=2

(5k)2/7=2

25k2=14

k2=14/25=0.56

√k2=√0.56

k=0.748331477...

5k2/7=2

5k2=14

k2=14/5=2.8

√k2=√2.8

k=1.673320053...

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15y ago

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