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k in (-oo:+oo)
260 = (260*k)/15 // - (260*k)/15
260-((260*k)/15) = 0
(-52/3)*k+260 = 0
260-52/3*k = 0 // - 260
-52/3*k = -260 // : -52/3
k = -260/(-52/3)
k = 15
k = 15
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