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(3/5)/4 = x/5 // - x/5
(3/5)/4-(x/5) = 0
3/20-1/5*x = 0 // - 3/20
-1/5*x = -3/20 // : -1/5
x = -3/20/(-1/5)
x = 3/4
x = 3/4
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