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w in (-oo:+oo)
7*(6*w+5) = 539 // - 539
7*(6*w+5)-539 = 0
7*(6*w+5)-539 = 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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