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1/5-((3*x)/15) = 4/5 // - 4/5
1/5-((3*x)/15)-(4/5) = 0
(-1/5)*x+1/5-4/5 = 0
-1/5*x-3/5 = 0 // + 3/5
-1/5*x = 3/5 // : -1/5
x = 3/5/(-1/5)
x = -3
x = -3
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