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x in (-oo:+oo)
(k*m)/3-(2*x) = 4 // - 4
(k*m)/3-(2*x)-4 = 0
(k*m)/3-2*x-4 = 0
1/3*k*m-2*x-4 = 0 // - 1/3*k*m-4
-2*x = -(1/3*k*m-4) // : -2
x = (-(1/3*k*m-4))/(-2)
x = (4-(1/3*k*m))/(-2)
x = (4-(1/3*k*m))/(-2)
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