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k in (-oo:+oo)
(134/21)*k = (7*40)/134 // - (7*40)/134
(134/21)*k-((7*40)/134) = 0
(134/21)*k-140/67 = 0
134/21*k-140/67 = 0 // + 140/67
134/21*k = 140/67 // : 134/21
k = 140/67/134/21
k = 1470/4489
k = 1470/4489
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