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