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k in (-oo:+oo)
-12*k = 4/7 // - 4/7
-12*k-(4/7) = 0
-12*k-4/7 = 0
-12*k-4/7 = 0 // + 4/7
-12*k = 4/7 // : -12
k = 4/7/(-12)
k = -1/21
k = -1/21
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