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w in (-oo:+oo)
-6*w-9 = 15-(4*w) // - 15-(4*w)
4*w-6*w-15-9 = 0
-2*w-24 = 0 // + 24
-2*w = 24 // : -2
w = 24/(-2)
w = -12
w = -12
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