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