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k in (-oo:+oo)
4*k+(6/7)*k+7/8 = -201/392 // + -201/392
4*k+(6/7)*k+7/8-(-201/392) = 0
4*k+(6/7)*k+7/8+201/392 = 0
34/7*k+68/49 = 0 // - 68/49
34/7*k = -68/49 // : 34/7
k = -68/49/34/7
k = -2/7
k = -2/7
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