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4 = 2/5-(5*x) // - 2/5-(5*x)
5*x-(2/5)+4 = 0
5*x-2/5+4 = 0
5*x+18/5 = 0 // - 18/5
5*x = -18/5 // : 5
x = -18/5/5
x = -18/25
x = -18/25
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