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w in (-oo:+oo)
(1/5)*w-((5/2)*w)-(2/5) = (1/10)*w-((1/2)*w)+3/5 // - (1/10)*w-((1/2)*w)+3/5
(1/5)*w-((5/2)*w)-((1/10)*w)+(1/2)*w-(2/5)-(3/5) = 0
(1/5)*w+(-5/2)*w+(-1/10)*w+(1/2)*w-2/5-3/5 = 0
-19/10*w-1 = 0 // + 1
-19/10*w = 1 // : -19/10
w = 1/(-19/10)
w = -10/19
w = -10/19
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