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w in (-oo:+oo)
-3*w-3 = 2*w-13 // - 2*w-13
13-3*w-(2*w)-3 = 0
13-3*w-2*w-3 = 0
10-5*w = 0 // - 10
-5*w = -10 // : -5
w = -10/(-5)
w = 2
w = 2
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