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x in (-oo:+oo)
8.1 = x/(-5) // - x/(-5)
8.1-(x/(-5)) = 0
1/5*x+8.1 = 0 // - 8.1
1/5*x = -8.1 // : 1/5
x = -8.1/1/5
x = -40.5
x = -40.5
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