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x in (-oo:+oo)
8/20 = x/15 // - x/15
8/20-(x/15) = 0
2/5-1/15*x = 0 // - 2/5
-1/15*x = -2/5 // : -1/15
x = -2/5/(-1/15)
x = 6
x = 6
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