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w in (-oo:+oo)
2*w-(6*w)-1 = -25 // + 25
2*w-(6*w)-1+25 = 0
2*w-6*w-1+25 = 0
24-4*w = 0 // - 24
-4*w = -24 // : -4
w = -24/(-4)
w = 6
w = 6
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