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w in (-oo:+oo)
(3/4)*w+5 = 71/16 // - 71/16
(3/4)*w-(71/16)+5 = 0
(3/4)*w-71/16+5 = 0
3/4*w+9/16 = 0 // - 9/16
3/4*w = -9/16 // : 3/4
w = -9/16/3/4
w = -3/4
w = -3/4
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