3x^2+6x+8=0
    2.5xln(25x/0.001006)+3.5x=1.7
    700x^5=177x^4+674x^3+980x^2+828x^x+809
    5000(1-x)+5000(1-x)^2=4050
    3.1*(x^2)-4.22*x+11.12=0
    3.1*x^2-4.22*x+11.12=0
    3.1*x^2-4.222222*x+1001/90=0
    (0.7x+1000000)^2 = (23x+1000000)^2+(11x+1000000)^2-2*(23x+1000000)*(11x+1000000)*cos59.95
    (0.7x+1000000)^2 = (23x+1000000)^2+(11x+1000000)^2-2*(23x+1000000)*(11x+1000000)*0.500755
    X+5=2
    0.125s^4+1.475s^3+15.35s^2+s=0
    (0.7x+1000000)^2=(23x+1000000)^2+(11x+1000000)^2-2*(23x+1000000)*(11x+1000000)*0.5008
    tanx-x=0
    700x^5=129x^4+489x^3+709x^2+598x+584
    10/(x-1)-(1001*x-1001)/(90*x)+2.1=0
    arcsin0.731858=x
    3a^(2)+14a－12＝0
    (25(x^2)/9)+6x-7=0
    arcsin0.737576=x
    arcsinx=0.737576

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