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w in (-oo:+oo)
7/5-6*w = (-7/2)*w-(1/2) // - (-7/2)*w-(1/2)
7/5-6*w-((-7/2)*w)+1/2 = 0
(7/2)*w-6*w+7/5+1/2 = 0
19/10-5/2*w = 0 // - 19/10
-5/2*w = -19/10 // : -5/2
w = -19/10/(-5/2)
w = 19/25
w = 19/25
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