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w in (-oo:+oo)
6*w+9/8 = w+6/8-6 // - w+6/8-6
6*w-w+9/8-(6/8)+6 = 0
6*w-w+9/8-3/4+6 = 0
5*w+51/8 = 0 // - 51/8
5*w = -51/8 // : 5
w = -51/8/5
w = -51/40
w = -51/40
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