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w in (-oo:+oo)
2*w+9*w+1/7+1/4 = 8 // - 8
2*w+9*w+1/7+1/4-8 = 0
11*w-213/28 = 0 // + 213/28
11*w = 213/28 // : 11
w = 213/28/11
w = 213/308
w = 213/308
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