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w in (-oo:+oo)
5-w-(4*w) = -25 // + 25
5-w-(4*w)+25 = 0
5-w-4*w+25 = 0
30-5*w = 0 // - 30
-5*w = -30 // : -5
w = -30/(-5)
w = 6
w = 6
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