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w in (-oo:+oo)
7*(3*w+6) = 273 // - 273
7*(3*w+6)-273 = 0
7*(3*w+6)-273 = 0
21*w-231 = 0
21*w-231 = 0
21*w-231 = 0 // + 231
21*w = 231 // : 21
w = 231/21
w = 11
w = 11
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