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    45*a=45
    X^2-8.9×10^(-7)+8.9*10^(-7)x=0
    25:15=x:3
    8:5=32:x
    180:9=20:x
    secarctan4/3
    sec0.442
    sec0.442
    atctan3/4
    2*x*x*x-4*x*x+3*x-6=0
    22.5x^2+47.5x+5=0
    10x=x^0. 2859
    (8x-16x²)²-4(4x²+1)(16x²-16x-4)=0
    x^3-5x^2+8x-13
    x^2+10^-5x-10^-4=0
    (1800-180)*135*(x-67.5)+180*x*x/2=6.6667*9161*(1536-x)
    (1800-180)×135×(x0-67.5)+180×x02/2=6.6667×9161×(1536-x0)
    1800*x*x=6.6667*9161*(1536-x)
    abs(4x^2-8x-12)=abs(x^2+x)
    x+√2=1

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