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w in (-oo:+oo)
-2/3 = (-7/2)*w-(1/5) // - (-7/2)*w-(1/5)
1/5-((-7/2)*w)-2/3 = 0
(7/2)*w-2/3+1/5 = 0
7/2*w-7/15 = 0 // + 7/15
7/2*w = 7/15 // : 7/2
w = 7/15/7/2
w = 2/15
w = 2/15
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