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