(x+1)^2*(x-1)/x=0
    24x+200-40*(16-x^2)^0.5
    20×(1+x)²=25
    2^x＝x^2
    x^2+2x+1=0
    40X-X*X=460
    40X-X*2=460
    2x+0.4=4.8
    (186+310)/31*x+248/31*(x+15)+124/31*(x+30)=1766
    （1-p）^7=0.2
    （1-p）^6=0.2
    （1-p）^6=0.2
    300=20t＋1/4t^
    （1-p）^6=0.2
    0.017=（x-478.1）/478.1
    3cosx
    (100-x)/7=(180-2x)/12
    100-x/7=180-2x/12
    35+10=40x-5
    log(sinx)

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