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w in (-oo:+oo)
5*(7-1*w) = 35 // - 35
5*(7-1*w)-35 = 0
5*(7-w)-35 = 0
5*(7-w)-35 = 0
-5*w = 0
-5*w = 0
-5*w = 0 // : -5
w = 0
w = 0
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