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w in (-oo:+oo)
35 = (-7/3)*w // - (-7/3)*w
35-((-7/3)*w) = 0
(7/3)*w+35 = 0
7/3*w+35 = 0 // - 35
7/3*w = -35 // : 7/3
w = -35/7/3
w = -15
w = -15
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