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w in (-oo:+oo)
1/7 = (-9/2)*w-(7/5) // - (-9/2)*w-(7/5)
1/7-((-9/2)*w)+7/5 = 0
(9/2)*w+1/7+7/5 = 0
9/2*w+54/35 = 0 // - 54/35
9/2*w = -54/35 // : 9/2
w = -54/35/9/2
w = -12/35
w = -12/35
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