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x in (-oo:+oo)
13/39 = x/(-15) // - x/(-15)
13/39-(x/(-15)) = 0
1/15*x+1/3 = 0 // - 1/3
1/15*x = -1/3 // : 1/15
x = -1/3/1/15
x = -5
x = -5
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