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w in (-oo:+oo)
4*w-2 = 2*w-12 // - 2*w-12
4*w-(2*w)-2+12 = 0
4*w-2*w-2+12 = 0
2*w+10 = 0 // - 10
2*w = -10 // : 2
w = -10/2
w = -5
w = -5
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