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w in (-oo:+oo)
(3/5)*w-(5*w)+3 = -19/45 // + -19/45
(3/5)*w-(5*w)-(-19/45)+3 = 0
(3/5)*w-5*w+19/45+3 = 0
154/45-22/5*w = 0 // - 154/45
-22/5*w = -154/45 // : -22/5
w = -154/45/(-22/5)
w = 7/9
w = 7/9
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