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