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w in (-oo:+oo)
-3*w-7 = 7*w-27 // - 7*w-27
27-3*w-(7*w)-7 = 0
27-3*w-7*w-7 = 0
20-10*w = 0 // - 20
-10*w = -20 // : -10
w = -20/(-10)
w = 2
w = 2
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