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x in (-oo:+oo)
15/25 = x/20 // - x/20
15/25-(x/20) = 0
3/5-1/20*x = 0 // - 3/5
-1/20*x = -3/5 // : -1/20
x = -3/5/(-1/20)
x = 12
x = 12
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