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