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w in (-oo:+oo)
3 = 2*w-(5*w)+9 // - 2*w-(5*w)+9
5*w-(2*w)-9+3 = 0
5*w-2*w-9+3 = 0
3*w-6 = 0 // + 6
3*w = 6 // : 3
w = 6/3
w = 2
w = 2
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