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w in (-oo:+oo)
2*w+6 = 4*w+0 // - 4*w+0
2*w-(4*w)+0+6 = 0
2*w-4*w+6 = 0
6-2*w = 0 // - 6
-2*w = -6 // : -2
w = -6/(-2)
w = 3
w = 3
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