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w in (-oo:+oo)
(4/5)*w+3/5 = (-1/2)*w+5/4 // - (-1/2)*w+5/4
(4/5)*w-((-1/2)*w)+3/5-(5/4) = 0
(4/5)*w+(1/2)*w+3/5-5/4 = 0
13/10*w-13/20 = 0 // + 13/20
13/10*w = 13/20 // : 13/10
w = 13/20/13/10
w = 1/2
w = 1/2
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