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w in (-oo:+oo)
(-4/5)*w+5*w-(1/5) = 13/5 // - 13/5
(-4/5)*w+5*w-(1/5)-(13/5) = 0
(-4/5)*w+5*w-1/5-13/5 = 0
21/5*w-14/5 = 0 // + 14/5
21/5*w = 14/5 // : 21/5
w = 14/5/21/5
w = 2/3
w = 2/3
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