K/2=21

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Solution for K/2=21 equation: 


K in (-oo:+oo)

K/2 = 21 // - 21

K/2-21 = 0

1/2*K-21 = 0 // + 21

1/2*K = 21 // : 1/2

K = 21/1/2

K = 42

K = 42

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