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