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w in (-oo:+oo)
-65 = 4*w+4*w-9 // - 4*w+4*w-9
9-(4*w)-(4*w)-65 = 0
9-4*w-4*w-65 = 0
-8*w-56 = 0 // + 56
-8*w = 56 // : -8
w = 56/(-8)
w = -7
w = -7
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