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w in (-oo:+oo)
7*(-4*w-4) = 140 // - 140
7*(-4*w-4)-140 = 0
7*(-4*w-4)-140 = 0
-28*w-168 = 0
-28*w-168 = 0
-28*w-168 = 0 // + 168
-28*w = 168 // : -28
w = 168/(-28)
w = -6
w = -6
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