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w in (-oo:+oo)
28 = (-3/4)*w // - (-3/4)*w
28-((-3/4)*w) = 0
(3/4)*w+28 = 0
3/4*w+28 = 0 // - 28
3/4*w = -28 // : 3/4
w = -28/3/4
w = -112/3
w = -112/3
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