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k in (-oo:+oo)
k/3+4 = (3*k)/5 // - (3*k)/5
k/3-((3*k)/5)+4 = 0
k/3+(-3/5)*k+4 = 0
4-4/15*k = 0 // - 4
-4/15*k = -4 // : -4/15
k = -4/(-4/15)
k = 15
k = 15
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