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x in (-oo:+oo)
6-x = (2/3)*x // - (2/3)*x
6-x-((2/3)*x) = 0
(-2/3)*x-x+6 = 0
6-5/3*x = 0 // - 6
-5/3*x = -6 // : -5/3
x = -6/(-5/3)
x = 18/5
x = 18/5
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