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