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w in (-oo:+oo)
6-5*w = -3*w-6 // + -3*w-6
6-5*w-(-3*w)+6 = 0
3*w-5*w+6+6 = 0
12-2*w = 0 // - 12
-2*w = -12 // : -2
w = -12/(-2)
w = 6
w = 6
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