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x in (-oo:+oo)
24/20 = x/15 // - x/15
24/20-(x/15) = 0
6/5-1/15*x = 0 // - 6/5
-1/15*x = -6/5 // : -1/15
x = -6/5/(-1/15)
x = 18
x = 18
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