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w in (-oo:+oo)
14 = (2/3)*w // - (2/3)*w
14-((2/3)*w) = 0
(-2/3)*w+14 = 0
14-2/3*w = 0 // - 14
-2/3*w = -14 // : -2/3
w = -14/(-2/3)
w = 21
w = 21
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