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w in (-oo:+oo)
30 = -w/5 // + -w/5
30-(-w/5) = 0
(1/5)*w+30 = 0
1/5*w+30 = 0 // - 30
1/5*w = -30 // : 1/5
w = -30/1/5
w = -150
w = -150
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