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w in (-oo:+oo)
4*(1*w+8) = 64 // - 64
4*(1*w+8)-64 = 0
4*(w+8)-64 = 0
4*(w+8)-64 = 0
4*w-32 = 0
4*w-32 = 0
4*w-32 = 0 // + 32
4*w = 32 // : 4
w = 32/4
w = 8
w = 8
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