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k in (-oo:+oo)
4-((1/5)*k) = 37/5-7*k // - 37/5-7*k
4-((1/5)*k)-(-7*k)-(37/5) = 0
(-1/5)*k+7*k-37/5+4 = 0
34/5*k-17/5 = 0 // + 17/5
34/5*k = 17/5 // : 34/5
k = 17/5/34/5
k = 1/2
k = 1/2
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