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w in (-oo:+oo)
35 = -w/2 // + -w/2
35-(-w/2) = 0
(1/2)*w+35 = 0
1/2*w+35 = 0 // - 35
1/2*w = -35 // : 1/2
w = -35/1/2
w = -70
w = -70
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