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w in (-oo:+oo)
7-2*w = 3*w-3 // - 3*w-3
3-2*w-(3*w)+7 = 0
3-2*w-3*w+7 = 0
10-5*w = 0 // - 10
-5*w = -10 // : -5
w = -10/(-5)
w = 2
w = 2
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