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w in (-oo:+oo)
-3*w-9 = 4*w-16 // - 4*w-16
16-3*w-(4*w)-9 = 0
16-3*w-4*w-9 = 0
7-7*w = 0 // - 7
-7*w = -7 // : -7
w = -7/(-7)
w = 1
w = 1
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