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