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k in (-oo:+oo)
k-((3/5)*k)-1/4 = -7/60 // + -7/60
k-((3/5)*k)-1/4-(-7/60) = 0
k+(-3/5)*k-1/4+7/60 = 0
2/5*k-2/15 = 0 // + 2/15
2/5*k = 2/15 // : 2/5
k = 2/15/2/5
k = 1/3
k = 1/3
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