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k in (-oo:+oo)
7*k+1/8 = (2/3)*k+39/8 // - (2/3)*k+39/8
7*k-((2/3)*k)+1/8-(39/8) = 0
7*k+(-2/3)*k+1/8-39/8 = 0
19/3*k-19/4 = 0 // + 19/4
19/3*k = 19/4 // : 19/3
k = 19/4/19/3
k = 3/4
k = 3/4
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