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50/(3/2) = x/20 // - x/20
50/(3/2)-(x/20) = 0
100/3-1/20*x = 0 // - 100/3
-1/20*x = -100/3 // : -1/20
x = -100/3/(-1/20)
x = 2000/3
x = 2000/3
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