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w in (-oo:+oo)
5*(2*w+1) = 105 // - 105
5*(2*w+1)-105 = 0
5*(2*w+1)-105 = 0
10*w-100 = 0
10*w-100 = 0
10*w-100 = 0 // + 100
10*w = 100 // : 10
w = 100/10
w = 10
w = 10
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