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w in (-oo:+oo)
-4/5 = (-3/2)*w-(8/7) // - (-3/2)*w-(8/7)
8/7-((-3/2)*w)-4/5 = 0
(3/2)*w-4/5+8/7 = 0
3/2*w+12/35 = 0 // - 12/35
3/2*w = -12/35 // : 3/2
w = -12/35/3/2
w = -8/35
w = -8/35
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