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w in (-oo:+oo)
2 = -7*w-w-6 // + -7*w-w-6
w-(-7*w)+2+6 = 0
7*w+w+2+6 = 0
8*w+8 = 0 // - 8
8*w = -8 // : 8
w = -8/8
w = -1
w = -1
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