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s in (-oo:+oo)
4000 = 35000-(s/6) // - 35000-(s/6)
s/6-35000+4000 = 0
1/6*s-31000 = 0 // + 31000
1/6*s = 31000 // : 1/6
s = 31000/1/6
s = 186000
s = 186000
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