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w in (-oo:+oo)
-54 = 5*w+4*w-9 // - 5*w+4*w-9
9-(5*w)-(4*w)-54 = 0
9-5*w-4*w-54 = 0
-9*w-45 = 0 // + 45
-9*w = 45 // : -9
w = 45/(-9)
w = -5
w = -5
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