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k in (-oo:+oo)
50 = -k/10 // + -k/10
50-(-k/10) = 0
(1/10)*k+50 = 0
1/10*k+50 = 0 // - 50
1/10*k = -50 // : 1/10
k = -50/1/10
k = -500
k = -500
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