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k in (-oo:+oo)
-3*k = -9/5 // + -9/5
-3*k-(-9/5) = 0
9/5-3*k = 0
9/5-3*k = 0 // - 9/5
-3*k = -9/5 // : -3
k = -9/5/(-3)
k = 3/5
k = 3/5
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