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x in (-oo:+oo)
1-((1/3)*(6*x-9)) = 0
(-1/3)*(6*x-9)+1 = 0
1-1/3*(6*x-9) = 0
1-1/3*(6*x-9) = 0
4-2*x = 0
4-2*x = 0
4-2*x = 0 // - 4
-2*x = -4 // : -2
x = -4/(-2)
x = 2
x = 2
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