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x in (-oo:+oo)
15/100 = x/400 // - x/400
15/100-(x/400) = 0
3/20-1/400*x = 0 // - 3/20
-1/400*x = -3/20 // : -1/400
x = -3/20/(-1/400)
x = 60
x = 60
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