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