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x in (-oo:+oo)
(1/3)*x-(2*x) = 28 // - 28
(1/3)*x-(2*x)-28 = 0
(1/3)*x-2*x-28 = 0
-5/3*x-28 = 0 // + 28
-5/3*x = 28 // : -5/3
x = 28/(-5/3)
x = -84/5
x = -84/5
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