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w in (-oo:+oo)
(1/2)*w+w-8 = -83/10 // + -83/10
(1/2)*w+w-(-83/10)-8 = 0
(1/2)*w+w+83/10-8 = 0
3/2*w+3/10 = 0 // - 3/10
3/2*w = -3/10 // : 3/2
w = -3/10/3/2
w = -1/5
w = -1/5
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