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9.5/19 = x/30 // - x/30
9.5/19-(x/30) = 0
0.5-1/30*x = 0 // - 0.5
-1/30*x = -0.5 // : -1/30
x = -0.5/(-1/30)
x = 15.0000015
x = 15.0000015
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