k/2=-20 - solution

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Solution for k/2=-20 equation:

k in (-oo:+oo)

k/2 = -20 // + 20

k/2+20 = 0

1/2*k+20 = 0 // - 20

1/2*k = -20 // : 1/2

k = -20/1/2

k = -40

k = -40

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