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