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