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w in (-oo:+oo)
(3/5)*w+3 = 7*w-(81/5) // - 7*w-(81/5)
(3/5)*w-(7*w)+81/5+3 = 0
(3/5)*w-7*w+81/5+3 = 0
96/5-32/5*w = 0 // - 96/5
-32/5*w = -96/5 // : -32/5
w = -96/5/(-32/5)
w = 3
w = 3
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