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w in (-oo:+oo)
5/2 = -7*w // + -7*w
5/2-(-7*w) = 0
7*w+5/2 = 0
7*w+5/2 = 0 // - 5/2
7*w = -5/2 // : 7
w = -5/2/7
w = -5/14
w = -5/14
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