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