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x in (-oo:+oo)
(x/(-1))/5 = 20 // - 20
(x/(-1))/5-20 = 0
-x/5-20 = 0
-1/5*x-20 = 0 // + 20
-1/5*x = 20 // : -1/5
x = 20/(-1/5)
x = -100
x = -100
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