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s in (-oo:+oo)
s = (1.02-1.02^10)/1-1.02 // - (1.02-1.02^10)/1-1.02
s-((1.02-1.02^10)/1)+1.02 = 0
s+1.02^10-1.02+1.02 = 0
s+1.02^10 = 0 // - 1.02^10
s = -1.02^10
s = -1.02^10
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