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w in (-oo:+oo)
7*(4*w+8) = -84 // + 84
7*(4*w+8)+84 = 0
7*(4*w+8)+84 = 0
28*w+140 = 0
28*w+140 = 0
28*w+140 = 0 // - 140
28*w = -140 // : 28
w = -140/28
w = -5
w = -5
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