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