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w in (-oo:+oo)
-5/8 = w-((3/4)*w)-(4/5) // - w-((3/4)*w)-(4/5)
(3/4)*w-w-5/8+4/5 = 0
7/40-1/4*w = 0 // - 7/40
-1/4*w = -7/40 // : -1/4
w = -7/40/(-1/4)
w = 7/10
w = 7/10
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