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w in (-oo:+oo)
7*w+3 = -1/2 // + -1/2
7*w-(-1/2)+3 = 0
7*w+1/2+3 = 0
7*w+7/2 = 0 // - 7/2
7*w = -7/2 // : 7
w = -7/2/7
w = -1/2
w = -1/2
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