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w in (-oo:+oo)
3-w = 17-3*w // - 17-3*w
3-w-(-3*w)-17 = 0
3*w-w-17+3 = 0
2*w-14 = 0 // + 14
2*w = 14 // : 2
w = 14/2
w = 7
w = 7
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