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w in (-oo:+oo)
7-2*w = 2*w-29 // - 2*w-29
7-2*w-(2*w)+29 = 0
7-2*w-2*w+29 = 0
36-4*w = 0 // - 36
-4*w = -36 // : -4
w = -36/(-4)
w = 9
w = 9
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