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w in (-oo:+oo)
6-7*w = 4*w-16 // - 4*w-16
6-7*w-(4*w)+16 = 0
6-7*w-4*w+16 = 0
22-11*w = 0 // - 22
-11*w = -22 // : -11
w = -22/(-11)
w = 2
w = 2
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