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x in (-oo:+oo)
4 = 3*x-(2/5) // - 3*x-(2/5)
2/5-(3*x)+4 = 0
2/5-3*x+4 = 0
22/5-3*x = 0 // - 22/5
-3*x = -22/5 // : -3
x = -22/5/(-3)
x = 22/15
x = 22/15
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