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w in (-oo:+oo)
-97 = 6*w+3*w+2 // - 6*w+3*w+2
-(6*w)-(3*w)-97-2 = 0
-6*w-3*w-97-2 = 0
-9*w-99 = 0 // + 99
-9*w = 99 // : -9
w = 99/(-9)
w = -11
w = -11
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