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w in (-oo:+oo)
-21 = (-7/6)*w // - (-7/6)*w
-((-7/6)*w)-21 = 0
(7/6)*w-21 = 0
7/6*w-21 = 0 // + 21
7/6*w = 21 // : 7/6
w = 21/7/6
w = 18
w = 18
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