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    x3=8000+7200+x+400
    34:x=85:5
    sin90+sin25
    1/(x*sqrt(4.56))=6.49
    X+5/6=11/12
    0.8:0.5=X:4
    (2x-1)^(2)=3x(1-2x)
    (y-1)^(2)-6(y-1)+9=0
    log(10,20/(x*sqrt(1+x^2)))=-0.3295
    90+arctan(23.5/6.325)-arctan(23.5/5)-arctan(23.5/16)-arctan(23.5/87.163)
    x = 50*(1-(1/1.04)^38)/0.04+1000/(1.04)^38
    x(2x+3)=5(2x+3)
    (0.609-0.46)/(0.609-0.388)
    x=50*(1-(1/1.04)^38)/0.04+1000/(1.04)^40
    (x-1280)/5200 = (x-2000)/4000
    50*(1-(1/(1+x)^40))/x+1000/(1+x)^40=1197.93
    6x^3-6x^2-3√3x-3√3=0
    50000+50000/(1+x)+100000/(1+x)^2+850000/(1+x)^3=1000000
    -4082750+3000000+X-X*2.5%-450000=300000
    1-(1-x)^3=9*x*(1-x)^2

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