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w in (-oo:+oo)
w-9 = 4*w-3 // - 4*w-3
w-(4*w)-9+3 = 0
w-4*w-9+3 = 0
-3*w-6 = 0 // + 6
-3*w = 6 // : -3
w = 6/(-3)
w = -2
w = -2
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