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w in (-oo:+oo)
2*w+8 = 13/2 // - 13/2
2*w-(13/2)+8 = 0
2*w-13/2+8 = 0
2*w+3/2 = 0 // - 3/2
2*w = -3/2 // : 2
w = -3/2/2
w = -3/4
w = -3/4
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