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k in (-oo:+oo)
7*k+4/9 = (1/2)*k+157/90 // - (1/2)*k+157/90
7*k-((1/2)*k)+4/9-(157/90) = 0
7*k+(-1/2)*k+4/9-157/90 = 0
13/2*k-13/10 = 0 // + 13/10
13/2*k = 13/10 // : 13/2
k = 13/10/13/2
k = 1/5
k = 1/5
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