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w in (-oo:+oo)
w/4 = 3.6 // - 3.6
w/4-3.6 = 0
1/4*w-3.6 = 0 // + 3.6
1/4*w = 3.6 // : 1/4
w = 3.6/1/4
w = 14.4
w = 14.4
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