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w in (-oo:+oo)
3 = 9*w+2*w-(1/8)-(7/4) // - 9*w+2*w-(1/8)-(7/4)
1/8-(9*w)-(2*w)+7/4+3 = 0
1/8-9*w-2*w+7/4+3 = 0
39/8-11*w = 0 // - 39/8
-11*w = -39/8 // : -11
w = -39/8/(-11)
w = 39/88
w = 39/88
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