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k in (-oo:+oo)
3 = (-3/7)*k-6 // - (-3/7)*k-6
3-((-3/7)*k)+6 = 0
(3/7)*k+3+6 = 0
3/7*k+9 = 0 // - 9
3/7*k = -9 // : 3/7
k = -9/3/7
k = -21
k = -21
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