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w in (-oo:+oo)
40 = (2/3)*w // - (2/3)*w
40-((2/3)*w) = 0
(-2/3)*w+40 = 0
40-2/3*w = 0 // - 40
-2/3*w = -40 // : -2/3
w = -40/(-2/3)
w = 60
w = 60
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