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    100x+100=0
    0.5149/(1+1.70x)+0.0274/(1+0.12x)-0.3052/(1-0.51x)
    x^2-1.2x+0.25=0
    45x+(62-x)x48=2859
    0.2164/(1+1.05x)-0.0488/(1-0.19x)-0.3956/(1-0.66x)
    100-x/80-x=-49/48
    0.2164/(1+1.05x)-0.0488/(1-0.12x)-0.3956/(1-0.66x)
    3*(2x-7)-15x=5*(4+3x)
    0.5145/(1+1.05x)-0.0418/(1-0.19x)-0.1584/(1-0.66x)=0
    42/(1+x)+42/(1+x)^2+42/(1+x)^3+42/(1+x)^4+42/(1+x)^5-150=0
    arctan(0.4*x)-arctan(0.2*x)-arctan(0.5*x)-arctan(0.08*x)=-90
    x-x*25%=36
    30/(1+x)+30/(1+x)^2+30/(1+x)^3+30/(1+x)^4+30/(1+x)^5-100=0
    0.5149/(1+1.05x)-0.0432/(1-0.19x)-0.1627/(1-0.66x)
    x-x*25%=34
    0.402436/0.43%*27.11
    1-1/(1+0.43%)^120
    1/(1+0.43%)^120
    x/65000=0.052(1+0.052)^10/(1+0.052)^9
    (x+1)(4x+5)^2(2x+3)=7

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