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w in (-oo:+oo)
3*w = 15/2 // - 15/2
3*w-(15/2) = 0
3*w-15/2 = 0
3*w-15/2 = 0 // + 15/2
3*w = 15/2 // : 3
w = 15/2/3
w = 5/2
w = 5/2
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