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k in (-oo:+oo)
8 = (-12*k)/(-4) // - (-12*k)/(-4)
8-((-12*k)/(-4)) = 0
8-3*k = 0
8-3*k = 0 // - 8
-3*k = -8 // : -3
k = -8/(-3)
k = 8/3
k = 8/3
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