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w in (-oo:+oo)
10 = (2/3)*w // - (2/3)*w
10-((2/3)*w) = 0
(-2/3)*w+10 = 0
10-2/3*w = 0 // - 10
-2/3*w = -10 // : -2/3
w = -10/(-2/3)
w = 15
w = 15
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