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19/20-(1/5) = x-(7/4) // - x-(7/4)
19/20-x-(1/5)+7/4 = 0
19/20-x-1/5+7/4 = 0
5/2-x = 0 // - 5/2
-x = -5/2 // * -1
x = 5/2
x = 5/2
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