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w in (-oo:+oo)
7*(6*w-4) = -490 // + 490
7*(6*w-4)+490 = 0
7*(6*w-4)+490 = 0
42*w+462 = 0
42*w+462 = 0
42*w+462 = 0 // - 462
42*w = -462 // : 42
w = -462/42
w = -11
w = -11
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