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k in (-oo:+oo)
6*k+3/7 = (-3/7)*k+228/7 // - (-3/7)*k+228/7
6*k-((-3/7)*k)+3/7-(228/7) = 0
6*k+(3/7)*k+3/7-228/7 = 0
45/7*k-225/7 = 0 // + 225/7
45/7*k = 225/7 // : 45/7
k = 225/7/45/7
k = 5
k = 5
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