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k in (-oo:+oo)
(2/3)*k-((2/7)*k)-(1/5) = -47/35 // + -47/35
(2/3)*k-((2/7)*k)-(1/5)-(-47/35) = 0
(2/3)*k+(-2/7)*k-1/5+47/35 = 0
8/21*k+8/7 = 0 // - 8/7
8/21*k = -8/7 // : 8/21
k = -8/7/8/21
k = -3
k = -3
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