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w in (-oo:+oo)
(3/8)*w+3 = (7/8)*w-1 // - (7/8)*w-1
(3/8)*w-((7/8)*w)+1+3 = 0
(3/8)*w+(-7/8)*w+1+3 = 0
4-1/2*w = 0 // - 4
-1/2*w = -4 // : -1/2
w = -4/(-1/2)
w = 8
w = 8
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