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w in (-oo:+oo)
w+9 = 17-3*w // - 17-3*w
w-(-3*w)-17+9 = 0
w+3*w-17+9 = 0
4*w-8 = 0 // + 8
4*w = 8 // : 4
w = 8/4
w = 2
w = 2
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