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x in (-oo:+oo)
3*x-(2/5) = 8*x // - 8*x
3*x-(8*x)-(2/5) = 0
3*x-8*x-2/5 = 0
-5*x-2/5 = 0 // + 2/5
-5*x = 2/5 // : -5
x = 2/5/(-5)
x = -2/25
x = -2/25
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