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w in (-oo:+oo)
8/7-((5/3)*w) = -7/2 // + -7/2
8/7-((5/3)*w)-(-7/2) = 0
(-5/3)*w+8/7+7/2 = 0
65/14-5/3*w = 0 // - 65/14
-5/3*w = -65/14 // : -5/3
w = -65/14/(-5/3)
w = 39/14
w = 39/14
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