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w in (-oo:+oo)
4*(7*w+6) = -284 // + 284
4*(7*w+6)+284 = 0
4*(7*w+6)+284 = 0
28*w+308 = 0
28*w+308 = 0
28*w+308 = 0 // - 308
28*w = -308 // : 28
w = -308/28
w = -11
w = -11
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