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k in (-oo:+oo)
-3 = (-1/3)*k-10 // - (-1/3)*k-10
10-((-1/3)*k)-3 = 0
(1/3)*k-3+10 = 0
1/3*k+7 = 0 // - 7
1/3*k = -7 // : 1/3
k = -7/1/3
k = -21
k = -21
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