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