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x in (-oo:+oo)
2*x-(1/5) = 4*x // - 4*x
2*x-(4*x)-(1/5) = 0
2*x-4*x-1/5 = 0
-2*x-1/5 = 0 // + 1/5
-2*x = 1/5 // : -2
x = 1/5/(-2)
x = -1/10
x = -1/10
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