20=-k/2

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Solution for 20=-k/2 equation: 


k in (-oo:+oo)

20 = -k/2 // + -k/2

20-(-k/2) = 0

(1/2)*k+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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