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w in (-oo:+oo)
w-5 = 3*w-25 // - 3*w-25
w-(3*w)-5+25 = 0
w-3*w-5+25 = 0
20-2*w = 0 // - 20
-2*w = -20 // : -2
w = -20/(-2)
w = 10
w = 10
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