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k in (-oo:+oo)
(-3/7)*k = -30/7 // + -30/7
(-3/7)*k-(-30/7) = 0
(-3/7)*k+30/7 = 0
30/7-3/7*k = 0 // - 30/7
-3/7*k = -30/7 // : -3/7
k = -30/7/(-3/7)
k = 10
k = 10
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