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x in (-oo:+oo)
-8 = (-2/3)*x // - (-2/3)*x
-((-2/3)*x)-8 = 0
(2/3)*x-8 = 0
2/3*x-8 = 0 // + 8
2/3*x = 8 // : 2/3
x = 8/2/3
x = 12
x = 12
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