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w in (-oo:+oo)
28 = (7/4)*w // - (7/4)*w
28-((7/4)*w) = 0
(-7/4)*w+28 = 0
28-7/4*w = 0 // - 28
-7/4*w = -28 // : -7/4
w = -28/(-7/4)
w = 16
w = 16
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