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w in (-oo:+oo)
28 = (4/3)*w // - (4/3)*w
28-((4/3)*w) = 0
(-4/3)*w+28 = 0
28-4/3*w = 0 // - 28
-4/3*w = -28 // : -4/3
w = -28/(-4/3)
w = 21
w = 21
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