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x in (-oo:+oo)
3/10 = 4*x-(1/5) // - 4*x-(1/5)
3/10-(4*x)+1/5 = 0
3/10-4*x+1/5 = 0
1/2-4*x = 0 // - 1/2
-4*x = -1/2 // : -4
x = -1/2/(-4)
x = 1/8
x = 1/8
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