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w in (-oo:+oo)
2*(-(4*w)-8) = -64 // + 64
2*(-(4*w)-8)+64 = 0
2*(-4*w-8)+64 = 0
2*(-4*w-8)+64 = 0
48-8*w = 0
48-8*w = 0
48-8*w = 0 // - 48
-8*w = -48 // : -8
w = -48/(-8)
w = 6
w = 6
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