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13.5/6 = x/30 // - x/30
13.5/6-(x/30) = 0
2.25-1/30*x = 0 // - 2.25
-1/30*x = -2.25 // : -1/30
x = -2.25/(-1/30)
x = 67.50000675
x = 67.50000675
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