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