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w in (-oo:+oo)
53 = 6*w-w+8 // - 6*w-w+8
w-(6*w)-8+53 = 0
w-6*w-8+53 = 0
45-5*w = 0 // - 45
-5*w = -45 // : -5
w = -45/(-5)
w = 9
w = 9
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