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((1/150)/1)/100 = x/30 // - x/30
((1/150)/1)/100-(x/30) = 0
(1/150)/100-(x/30) = 0
1/15000-1/30*x = 0 // - 1/15000
-1/30*x = -1/15000 // : -1/30
x = -1/15000/(-1/30)
x = 1/500
x = 1/500
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