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x in (-oo:+oo)
10/15 = x/80 // - x/80
10/15-(x/80) = 0
2/3-1/80*x = 0 // - 2/3
-1/80*x = -2/3 // : -1/80
x = -2/3/(-1/80)
x = 160/3
x = 160/3
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