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k in (-oo:+oo)
(4/7)*k-3 = -37/7 // + -37/7
(4/7)*k-(-37/7)-3 = 0
(4/7)*k+37/7-3 = 0
4/7*k+16/7 = 0 // - 16/7
4/7*k = -16/7 // : 4/7
k = -16/7/4/7
k = -4
k = -4
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