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x in (-oo:+oo)
8.1 = x/15 // - x/15
8.1-(x/15) = 0
8.1-1/15*x = 0 // - 8.1
-1/15*x = -8.1 // : -1/15
x = -8.1/(-1/15)
x = 121.49999393
x = 121.49999393
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