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k in (-oo:+oo)
(4/5)*k+9/10 = 141/50-(4*k) // - 141/50-(4*k)
(4/5)*k+4*k+9/10-(141/50) = 0
(4/5)*k+4*k+9/10-141/50 = 0
24/5*k-48/25 = 0 // + 48/25
24/5*k = 48/25 // : 24/5
k = 48/25/24/5
k = 2/5
k = 2/5
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