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w in (-oo:+oo)
58 = 4*w+2*w-8 // - 4*w+2*w-8
8-(4*w)-(2*w)+58 = 0
8-4*w-2*w+58 = 0
66-6*w = 0 // - 66
-6*w = -66 // : -6
w = -66/(-6)
w = 11
w = 11
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