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    -x²+180x-8720=0
    x=-2.01×lg(1.38×10^-6+9.74×10^-8×x)
    10^ x=(1.38×0.000001+9.74×0.00000001×x)^-2.01
    2(x+24.2)=50+220-2x
    x*x-1=-2
    x(80-2x)=800
    x^2-1/2-7/16=0
    m²+2m-14=0
    x÷2.14
    x÷2.14
    8.3*10^-9*(3.67*10^-4)=(3.67*10^-4y+y^2)
    500*sin(30-x)=(1000*cos(x)-500)/3
    500*sin(30-x)=(1000*cos(x)-500)/3
    500*sin(30-x)=(1000*cos(x)-500)/3
    3000*sin(30-x)=(6000*cos(x)-3000)/3
    2000*sin(30-x)=(4000*cos(x)-2000)/3
    1300*sin(30-x)=(2600*cos(x)-1300)/3
    6*sqrt(3-3*b^2)-(6-2600)*b+2600=0
    6*sqrt(3-3*b^2)-(6-2600)*b+2600=0
    6*sqrt(3-3*x^2)-(6-2600)*x+2600=0

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