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k in (-oo:+oo)
2 = -k/4-10 // + -k/4-10
2-(-k/4)+10 = 0
(1/4)*k+2+10 = 0
1/4*k+12 = 0 // - 12
1/4*k = -12 // : 1/4
k = -12/1/4
k = -48
k = -48
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