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k in (-oo:+oo)
7*(4*k-6) = -350 // + 350
7*(4*k-6)+350 = 0
7*(4*k-6)+350 = 0
28*k+308 = 0
28*k+308 = 0
28*k+308 = 0 // - 308
28*k = -308 // : 28
k = -308/28
k = -11
k = -11
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