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k in (-oo:+oo)
(12/3)*k+32/7 = (5/3)*k-((31/8)*k)+59/84 // - (5/3)*k-((31/8)*k)+59/84
(12/3)*k-((5/3)*k)+(31/8)*k+32/7-(59/84) = 0
(12/3)*k+(-5/3)*k+(31/8)*k+32/7-59/84 = 0
149/24*k+325/84 = 0 // - 325/84
149/24*k = -325/84 // : 149/24
k = -325/84/149/24
k = -650/1043
k = -650/1043
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