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w in (-oo:+oo)
1-6*w = 4*w+21 // - 4*w+21
1-6*w-(4*w)-21 = 0
1-6*w-4*w-21 = 0
-10*w-20 = 0 // + 20
-10*w = 20 // : -10
w = 20/(-10)
w = -2
w = -2
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