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x in (-oo:+oo)
6/20 = x/50 // - x/50
6/20-(x/50) = 0
3/10-1/50*x = 0 // - 3/10
-1/50*x = -3/10 // : -1/50
x = -3/10/(-1/50)
x = 15
x = 15
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