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