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w in (-oo:+oo)
7*(3-6*w) = -273 // + 273
7*(3-6*w)+273 = 0
7*(3-6*w)+273 = 0
294-42*w = 0
294-42*w = 0
294-42*w = 0 // - 294
-42*w = -294 // : -42
w = -294/(-42)
w = 7
w = 7
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