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w in (-oo:+oo)
35 = (7/5)*w // - (7/5)*w
35-((7/5)*w) = 0
(-7/5)*w+35 = 0
35-7/5*w = 0 // - 35
-7/5*w = -35 // : -7/5
w = -35/(-7/5)
w = 25
w = 25
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