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w in (-oo:+oo)
1-(5*w) = 31 // - 31
1-(5*w)-31 = 0
1-5*w-31 = 0
-5*w-30 = 0 // + 30
-5*w = 30 // : -5
w = 30/(-5)
w = -6
w = -6
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