k/8=21

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Solution for k/8=21 equation: 


k in (-oo:+oo)

k/8 = 21 // - 21

k/8-21 = 0

1/8*k-21 = 0 // + 21

1/8*k = 21 // : 1/8

k = 21/1/8

k = 168

k = 168

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