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w in (-oo:+oo)
-7/3 = (-1/7)*w-(5/2) // - (-1/7)*w-(5/2)
5/2-((-1/7)*w)-7/3 = 0
(1/7)*w-7/3+5/2 = 0
1/7*w+1/6 = 0 // - 1/6
1/7*w = -1/6 // : 1/7
w = -1/6/1/7
w = -7/6
w = -7/6
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