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w in (-oo:+oo)
w/28+6.5 = 11 // - 11
w/28-11+6.5 = 0
1/28*w-4.5 = 0 // + 4.5
1/28*w = 4.5 // : 1/28
w = 4.5/1/28
w = 125.99998488
w = 125.99998488
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