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w in (-oo:+oo)
5*w-w+1/2 = -39/2 // + -39/2
5*w-w+1/2-(-39/2) = 0
5*w-w+1/2+39/2 = 0
4*w+20 = 0 // - 20
4*w = -20 // : 4
w = -20/4
w = -5
w = -5
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