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D( w )
w-((8/15)*w) = 0
w-((8/15)*w) = 0
w-((8/15)*w) = 0
w+(-8/15)*w = 0
7/15*w = 0 // : 7/15
w = 0
w in (-oo:0) U (0:+oo)
(7*w-(56/55))/(w-((8/15)*w)) = 0
(7*w-56/55)/(w+(-8/15)*w) = 0
(7*w-56/55)/(7/15*w) = 0
7*w-56/55 = 0 // + 56/55
7*w = 56/55 // : 7
w = 56/55/7
w = 8/55
w = 8/55
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