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k in (-oo:+oo)
10-((3/5)*k) = 4*k+27/5 // - 4*k+27/5
10-((3/5)*k)-(4*k)-(27/5) = 0
(-3/5)*k-4*k-27/5+10 = 0
23/5-23/5*k = 0 // - 23/5
-23/5*k = -23/5 // : -23/5
k = -23/5/(-23/5)
k = 1
k = 1
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