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k in (-oo:+oo)
2*k-(2/3) = (-3/7)*k-(575/21) // - (-3/7)*k-(575/21)
2*k-((-3/7)*k)-(2/3)+575/21 = 0
2*k+(3/7)*k-2/3+575/21 = 0
17/7*k+187/7 = 0 // - 187/7
17/7*k = -187/7 // : 17/7
k = -187/7/17/7
k = -11
k = -11
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