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w in (-oo:+oo)
7*(8-(4*w)) = 308 // - 308
7*(8-(4*w))-308 = 0
7*(8-4*w)-308 = 0
7*(8-4*w)-308 = 0
-28*w-252 = 0
-28*w-252 = 0
-28*w-252 = 0 // + 252
-28*w = 252 // : -28
w = 252/(-28)
w = -9
w = -9
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