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x in (-oo:+oo)
15/45 = x/(-6) // - x/(-6)
15/45-(x/(-6)) = 0
1/6*x+1/3 = 0 // - 1/3
1/6*x = -1/3 // : 1/6
x = -1/3/1/6
x = -2
x = -2
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