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4/5-((1/4)*x) = 17/20 // - 17/20
4/5-((1/4)*x)-(17/20) = 0
(-1/4)*x+4/5-17/20 = 0
-1/4*x-1/20 = 0 // + 1/20
-1/4*x = 1/20 // : -1/4
x = 1/20/(-1/4)
x = -1/5
x = -1/5
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