(2141.2-y)/y＝3.1％
    (2007.7-y)/y＝2.7％
    (538.7-y)/y＝6.9％
    (547.3-y)/y＝6.9％
    (541.1-y)/y＝7.2％
    (563-y)/y＝7.4％
    (563-y)/y＝7.4
    x*x+8x+100
    x*2+8x+100
    X/6+X+1/8=1
    X+1=X
    120-8x = 160-20x
    3/1^abs-2X-4
    3(x+15)=15-5(x-7)
    4x-3(20-x)=-4
    n*n+n=4036
    x+2.25+2.25x=6
    x-1=6
    X*100/80/1.05/125*100=42
    X*100/50/1.05/125*100=151

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