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