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x in (-oo:+oo)
12 = (2/3)*x // - (2/3)*x
12-((2/3)*x) = 0
(-2/3)*x+12 = 0
12-2/3*x = 0 // - 12
-2/3*x = -12 // : -2/3
x = -12/(-2/3)
x = 18
x = 18
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