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w in (-oo:+oo)
(5/3)*(9-w) = -10 // + 10
(5/3)*(9-w)+10 = 0
5/3*(9-w)+10 = 0
5/3*(9-w)+10 = 0
25-5/3*w = 0
25-5/3*w = 0
25-5/3*w = 0 // - 25
-5/3*w = -25 // : -5/3
w = -25/(-5/3)
w = 15
w = 15
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