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x in (-oo:+oo)
3/1 = x/(-5) // - x/(-5)
3/1-(x/(-5)) = 0
3-(x/(-5)) = 0
1/5*x+3 = 0 // - 3
1/5*x = -3 // : 1/5
x = -3/1/5
x = -15
x = -15
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