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x in (-oo:+oo)
4*k+(2*x)/3 = 2*x // - 2*x
4*k+(2*x)/3-(2*x) = 0
4*k+(2*x)/3-2*x = 0
4*k-4/3*x = 0 // - 4*k
-4/3*x = -(4*k) // : -4/3
x = (-(4*k))/(-4/3)
x = 3*k
x = 3*k
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