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x in (-oo:+oo)
(1/3)*x-(6/3) = 2*x+4 // - 2*x+4
(1/3)*x-(2*x)-(6/3)-4 = 0
(1/3)*x-2*x-4-2 = 0
-5/3*x-6 = 0 // + 6
-5/3*x = 6 // : -5/3
x = 6/(-5/3)
x = -18/5
x = -18/5
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