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w in (-oo:+oo)
1-(5*w) = 21 // - 21
1-(5*w)-21 = 0
1-5*w-21 = 0
-5*w-20 = 0 // + 20
-5*w = 20 // : -5
w = 20/(-5)
w = -4
w = -4
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