e^x=x^-1
    2(x+24.2)=50+220-2x+88
    2(x+24.2)=50+220-2x
    X+X*0.09=5512
    X+X*0.09 = 5512
    1-1/(1+1.5%)^N/1.5%=50
    1-1/(1+1.5%)^N/1.5%=50
    8＾17(mod 77)
    （41.183+x）×1.75＝41.183+75.166-x
    （41.183+x）×1.75＝41.183+76.166-x
    8＾17 (mod77)
    8x=-16x+56
    x-x*0.24=1000
    100*22+100*20.4+x*82=25
    100*22+100*20.4+x*82=(200* x)*25
    100*22+100*20.4+x*82=(200 x)*25
    100*22+100*20.4+x*82=(100+ x)*25
    (X-500)*(1-25%)/400=(X-500)*(1-25%)-850*12%/300
    （x-500）*0.75/400=（x-500）*0.75-102/300
    x+lnx=0

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