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