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w in (-oo:+oo)
70 = 6-4*w-(4*w) // - 6-4*w-(4*w)
4*w-(-4*w)-6+70 = 0
4*w+4*w-6+70 = 0
8*w+64 = 0 // - 64
8*w = -64 // : 8
w = -64/8
w = -8
w = -8
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