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3/5-((1/2)*x) = 2/5 // - 2/5
3/5-((1/2)*x)-(2/5) = 0
(-1/2)*x+3/5-2/5 = 0
1/5-1/2*x = 0 // - 1/5
-1/2*x = -1/5 // : -1/2
x = -1/5/(-1/2)
x = 2/5
x = 2/5
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