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x in (-oo:+oo)
3*(x+2/5) = (x^1)/3 // - (x^1)/3
3*(x+2/5)-((x^1)/3) = 0
3*(x+2/5)-(x/3) = 0
3*(x+2/5)-x/3 = 0
(3^2*(x+2/5))/3-x/3 = 0
3^2*(x+2/5)-x = 0
8*x+18/5 = 0
(8*x+18/5)/3 = 0
(8*x+18/5)/3 = 0 // * 3
8*x+18/5 = 0
8*x+18/5 = 0 // - 18/5
8*x = -18/5 // : 8
x = -18/5/8
x = -9/20
x = -9/20
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