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    x+[-0.0018*(1-x)^2+0.0306*x]*25=0.043
    x+5/4x²
    x+[-0.0018*(1-x)^2+0.0338*x]*25=0.0381
    x+[-0.0018*(1-x)^2+0.0352*x]*25=0.03
    -x^2+500+40X=0
    x+[-0.0018*(1-x)^2+0.0364*x]*50=0
    112-8x=(80-8x)*2
    x^6+25x^4-400x^2=400
    x*(1-cos(3151.5/x))-2.561
    2.561=x*(1-cos(3151.5/x))
    arcsec2
    arcsec1
    50+0.08*x-0.00005*x^2=0
    50+100*10^(-6)*800*x-0.5*100*10^(-6)*x^2=0
    0.65*x*3.48*1.01=2.4
    arctanx-arctan0.1x=45
    (52628/64451)*0.5+(((2632+4782-x)/7050)*0.5)=x/8083
    (1+r)+(1+r)^2+(1+r)^3+(1+r)^4+(1+r)^5 = 5.7614
    (1+r)*1+(1+r)^2+(1+r)^3+(1+r)^4+(1+r)^5 = 5.7614
    (52628/64451)*0.5+(((2632+4782-x)/7050)*0.5)=x/8083

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