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w in (-oo:+oo)
(1/2)*w+15 = w-11 // - w-11
(1/2)*w-w+11+15 = 0
26-1/2*w = 0 // - 26
-1/2*w = -26 // : -1/2
w = -26/(-1/2)
w = 52
w = 52
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