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w in (-oo:+oo)
1-(6*w) = 4*w+71 // - 4*w+71
1-(6*w)-(4*w)-71 = 0
1-6*w-4*w-71 = 0
-10*w-70 = 0 // + 70
-10*w = 70 // : -10
w = 70/(-10)
w = -7
w = -7
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