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(5/4)/45 = x/80 // - x/80
(5/4)/45-(x/80) = 0
1/36-1/80*x = 0 // - 1/36
-1/80*x = -1/36 // : -1/80
x = -1/36/(-1/80)
x = 20/9
x = 20/9
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