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w in (-oo:+oo)
w-((2/5)*w)-(1/5) = (5/2)*(w-(3/5)) // - (5/2)*(w-(3/5))
w-((5/2)*(w-(3/5)))-((2/5)*w)-(1/5) = 0
(-5/2)*(w-3/5)+w+(-2/5)*w-1/5 = 0
w-5/2*(w-3/5)+(-2*w)/5-1/5 = 0
(-5/2*5*(w-3/5))/5+(5*w)/5+(-2*w)/5-1/5 = 0
5*w-5/2*5*(w-3/5)-2*w-1 = 0
15/2-15/2*w-2*w-1 = 0
15/2-19/2*w-1 = 0
13/2-19/2*w = 0
(13/2-19/2*w)/5 = 0
(13/2-19/2*w)/5 = 0 // * 5
13/2-19/2*w = 0
13/2-19/2*w = 0 // - 13/2
-19/2*w = -13/2 // : -19/2
w = -13/2/(-19/2)
w = 13/19
w = 13/19
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