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w in (-oo:+oo)
w/3 = 7.5 // - 7.5
w/3-7.5 = 0
1/3*w-7.5 = 0 // + 7.5
1/3*w = 7.5 // : 1/3
w = 7.5/1/3
w = 22.50000023
w = 22.50000023
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