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w in (-oo:+oo)
7*w-2 = 54-7*w // - 54-7*w
7*w-(-7*w)-54-2 = 0
7*w+7*w-54-2 = 0
14*w-56 = 0 // + 56
14*w = 56 // : 14
w = 56/14
w = 4
w = 4
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