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w in (-oo:+oo)
5/4-((-1/5)*w) = 0
(1/5)*w+5/4 = 0
1/5*w+5/4 = 0 // - 5/4
1/5*w = -5/4 // : 1/5
w = -5/4/1/5
w = -25/4
w = -25/4
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