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w in (-oo:+oo)
8-w = 3-6*w // - 3-6*w
8-w-(-6*w)-3 = 0
6*w-w-3+8 = 0
5*w+5 = 0 // - 5
5*w = -5 // : 5
w = -5/5
w = -1
w = -1
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