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k in (-oo:+oo)
k = 2*(-2/(3^2))+9*(-2/3)+10 // - 2*(-2/(3^2))+9*(-2/3)+10
k-(2*(-2/(3^2)))-(9*(-2/3))-10 = 0
k+4*3^-2-10+6 = 0
k-32/9 = 0 // + 32/9
k = 32/9
k = 32/9
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