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k in (-oo:+oo)
3/8-7*k = 307/72-2*k // - 307/72-2*k
3/8-7*k-(-2*k)-(307/72) = 0
2*k-7*k+3/8-307/72 = 0
-5*k-35/9 = 0 // + 35/9
-5*k = 35/9 // : -5
k = 35/9/(-5)
k = -7/9
k = -7/9
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