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x in (-oo:+oo)
(2/3)*x = 6*k // - 6*k
(2/3)*x-(6*k) = 0
(2/3)*x-6*k = 0
2/3*x-6*k = 0 // + -6*k
2/3*x = -(-6*k) // : 2/3
x = (-(-6*k))/2/3
x = 9*k
x = 9*k
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