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