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