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6-(x/4)-x = 4/5 // - 4/5
6-(x/4)-x-(4/5) = 0
6-(x/4)-x-4/5 = 0
26/5-5/4*x = 0 // - 26/5
-5/4*x = -26/5 // : -5/4
x = -26/5/(-5/4)
x = 104/25
x = 104/25
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