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x in (-oo:+oo)
-((2/3)*x)-8 = -10/3 // + -10/3
-((2/3)*x)-(-10/3)-8 = 0
(-2/3)*x+10/3-8 = 0
-2/3*x-14/3 = 0 // + 14/3
-2/3*x = 14/3 // : -2/3
x = 14/3/(-2/3)
x = -7
x = -7
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