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w in (-oo:+oo)
2*w-2 = -4*w-38 // + -4*w-38
2*w-(-4*w)-2+38 = 0
2*w+4*w-2+38 = 0
6*w+36 = 0 // - 36
6*w = -36 // : 6
w = -36/6
w = -6
w = -6
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