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w in (-oo:+oo)
(1/2)*w-3 = -13/2 // + -13/2
(1/2)*w-(-13/2)-3 = 0
(1/2)*w+13/2-3 = 0
1/2*w+7/2 = 0 // - 7/2
1/2*w = -7/2 // : 1/2
w = -7/2/1/2
w = -7
w = -7
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