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x in (-oo:+oo)
(2/5)*x-(4*x) = 2 // - 2
(2/5)*x-(4*x)-2 = 0
(2/5)*x-4*x-2 = 0
-18/5*x-2 = 0 // + 2
-18/5*x = 2 // : -18/5
x = 2/(-18/5)
x = -5/9
x = -5/9
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