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x in (-oo:+oo)
(2/5)*x-((1/2)*x) = 2 // - 2
(2/5)*x-((1/2)*x)-2 = 0
(2/5)*x+(-1/2)*x-2 = 0
-1/10*x-2 = 0 // + 2
-1/10*x = 2 // : -1/10
x = 2/(-1/10)
x = -20
x = -20
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