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x in (-oo:+oo)
-2/5 = (-4/3)*x-(1/2) // - (-4/3)*x-(1/2)
1/2-((-4/3)*x)-2/5 = 0
(4/3)*x-2/5+1/2 = 0
4/3*x+1/10 = 0 // - 1/10
4/3*x = -1/10 // : 4/3
x = -1/10/4/3
x = -3/40
x = -3/40
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