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w in (-oo:+oo)
(1/2)*w+7/10 = 9/20 // - 9/20
(1/2)*w+7/10-(9/20) = 0
(1/2)*w+7/10-9/20 = 0
1/2*w+1/4 = 0 // - 1/4
1/2*w = -1/4 // : 1/2
w = -1/4/1/2
w = -1/2
w = -1/2
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