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