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w in (-oo:+oo)
2*(1*w-1) = 12 // - 12
2*(1*w-1)-12 = 0
2*(w-1)-12 = 0
2*(w-1)-12 = 0
2*w-14 = 0
2*w-14 = 0
2*w-14 = 0 // + 14
2*w = 14 // : 2
w = 14/2
w = 7
w = 7
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