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