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w in (-oo:+oo)
35 = (7/3)*w // - (7/3)*w
35-((7/3)*w) = 0
(-7/3)*w+35 = 0
35-7/3*w = 0 // - 35
-7/3*w = -35 // : -7/3
w = -35/(-7/3)
w = 15
w = 15
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