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k in (-oo:+oo)
(7/10)*k = 1/14-(4/15) // - 1/14-(4/15)
(7/10)*k-(1/14)+4/15 = 0
(7/10)*k-1/14+4/15 = 0
7/10*k+41/210 = 0 // - 41/210
7/10*k = -41/210 // : 7/10
k = -41/210/7/10
k = -41/147
k = -41/147
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