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w in (-oo:+oo)
18 = 20-w/32 // - 20-w/32
18-(-w/32)-20 = 0
(1/32)*w-20+18 = 0
1/32*w-2 = 0 // + 2
1/32*w = 2 // : 1/32
w = 2/1/32
w = 64
w = 64
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