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w in (-oo:+oo)
7*(6*w+8) = 350 // - 350
7*(6*w+8)-350 = 0
7*(6*w+8)-350 = 0
42*w-294 = 0
42*w-294 = 0
42*w-294 = 0 // + 294
42*w = 294 // : 42
w = 294/42
w = 7
w = 7
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