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20/15 = x/12000 // - x/12000
20/15-(x/12000) = 0
4/3-1/12000*x = 0 // - 4/3
-1/12000*x = -4/3 // : -1/12000
x = -4/3/(-1/12000)
x = 16000
x = 16000
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