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w in (-oo:+oo)
4/3-12 = (2/3)*w // - (2/3)*w
4/3-((2/3)*w)-12 = 0
(-2/3)*w+4/3-12 = 0
-2/3*w-32/3 = 0 // + 32/3
-2/3*w = 32/3 // : -2/3
w = 32/3/(-2/3)
w = -16
w = -16
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