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w in (-oo:+oo)
(2/3)*w-((4/5)*w)+4/5 = 7/10 // - 7/10
(2/3)*w-((4/5)*w)+4/5-(7/10) = 0
(2/3)*w+(-4/5)*w+4/5-7/10 = 0
1/10-2/15*w = 0 // - 1/10
-2/15*w = -1/10 // : -2/15
w = -1/10/(-2/15)
w = 3/4
w = 3/4
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