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k in (-oo:+oo)
(k-4)/8+k-5 = 30 // - 30
(k-4)/8+k-30-5 = 0
(k-4)/8+(8*k)/8+(-30*8)/8+(-5*8)/8 = 0
k+8*k-30*8-5*8-4 = 0
9*k-240-40-4 = 0
9*k-244-40 = 0
9*k-284 = 0
(9*k-284)/8 = 0
(9*k-284)/8 = 0 // * 8
9*k-284 = 0
9*k-284 = 0 // + 284
9*k = 284 // : 9
k = 284/9
k = 284/9
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