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    p=20000000/(1-5%)
    4/5x=-x+2
    500000*P*(1-5%)-500000*80-3000000=0
    (P-90-8)*50-300=0
    -5000-5000/(1+x)+1600×((1+x)^3-1)/(x×(1+x)^4)=0
    -26+33=9.1+x
    X-(X/1.03*0.03(1+10%))-0.8%X=37600
    X-(X/1.03*0.03(1+10%))-2.8%X=37600
    2x^3-3x^2-27=0
    23773.3*(1+x)^4=45672.5
    13.09c=(3.2+c)×7.97
    13.09c=(3.3+c)×7.96
    13.09c=(3.5+c)×7.96
    13.09c=(3.5+c)×7.97
    (100-3x)/4*3x=400
    (1+x)∧2=1.75
    (1+x)2=1.75
    [(144-12x)/13]²+x²=(12-x)²
    [(144-12x)/13]²=x²+(12-x)²
    (800+x-12168.93-0)*(1-25%)+5213.15=5634.18

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