k/4=-21

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Solution for k/4=-21 equation: 


k in (-oo:+oo)

k/4 = -21 // + 21

k/4+21 = 0

1/4*k+21 = 0 // - 21

1/4*k = -21 // : 1/4

k = -21/1/4

k = -84

k = -84

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