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k in (-oo:+oo)
2*k-(12/3) = 10 // - 10
2*k-(12/3)-10 = 0
2*k-10-4 = 0
2*k-14 = 0 // + 14
2*k = 14 // : 2
k = 14/2
k = 7
k = 7
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