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W in (-oo:+oo)
W/4 = 2.1 // - 2.1
W/4-2.1 = 0
1/4*W-2.1 = 0 // + 2.1
1/4*W = 2.1 // : 1/4
W = 2.1/1/4
W = 8.4
W = 8.4
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