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20-(1/3) = 72*x // - 72*x
20-(72*x)-(1/3) = 0
20-72*x-1/3 = 0
59/3-72*x = 0 // - 59/3
-72*x = -59/3 // : -72
x = -59/3/(-72)
x = 59/216
x = 59/216
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