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w in (-oo:+oo)
(3/4)*w = 2130 // - 2130
(3/4)*w-2130 = 0
3/4*w-2130 = 0 // + 2130
3/4*w = 2130 // : 3/4
w = 2130/3/4
w = 2840
w = 2840
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