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