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x in (-oo:+oo)
15/25 = x/50 // - x/50
15/25-(x/50) = 0
3/5-1/50*x = 0 // - 3/5
-1/50*x = -3/5 // : -1/50
x = -3/5/(-1/50)
x = 30
x = 30
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