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w in (-oo:+oo)
2*w-2 = 54-5*w // - 54-5*w
2*w-(-5*w)-54-2 = 0
2*w+5*w-54-2 = 0
7*w-56 = 0 // + 56
7*w = 56 // : 7
w = 56/7
w = 8
w = 8
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