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w in (-oo:+oo)
49 = (-7/3)*w // - (-7/3)*w
49-((-7/3)*w) = 0
(7/3)*w+49 = 0
7/3*w+49 = 0 // - 49
7/3*w = -49 // : 7/3
w = -49/7/3
w = -21
w = -21
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