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w in (-oo:+oo)
6*(7*w+7) = -462 // + 462
6*(7*w+7)+462 = 0
6*(7*w+7)+462 = 0
42*w+504 = 0
42*w+504 = 0
42*w+504 = 0 // - 504
42*w = -504 // : 42
w = -504/42
w = -12
w = -12
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