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k in (-oo:+oo)
(2*k)/7 = -2/11 // + -2/11
(2*k)/7-(-2/11) = 0
(2*k)/7+2/11 = 0
2/7*k+2/11 = 0 // - 2/11
2/7*k = -2/11 // : 2/7
k = -2/11/2/7
k = -7/11
k = -7/11
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