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w in (-oo:+oo)
3*w+w+4 = 32/2 // - 32/2
3*w+w-(32/2)+4 = 0
3*w+w-16+4 = 0
4*w-12 = 0 // + 12
4*w = 12 // : 4
w = 12/4
w = 3
w = 3
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