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w in (-oo:+oo)
5*(6*w+1) = -25 // + 25
5*(6*w+1)+25 = 0
5*(6*w+1)+25 = 0
30*w+30 = 0
30*w+30 = 0
30*w+30 = 0 // - 30
30*w = -30 // : 30
w = -30/30
w = -1
w = -1
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