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    20/89.14+2/45+5/44.7+X/1000+(60.5-X)/1650=0.432
    20/89.14+3/45+5/44.7+X/1000+(59.5-X)/1650=0.432
    (30-1.5x)*(31-2x)=7.89
    (30-1.5x)*(42.5-2x)=11.07
    -5*x*x+6*x+7=0
    -6=2+2m-3
    -2130.88+634.4/(1+IRR)^1+1126.41/(1+IRR)^2+4881.15/(1+IRR)^3+2457.83/(1+IRR)^4-749.07/(1+IRR)^5=0
    arctanx+arctan(x/5)=90
    277.91*(1+x)*(1+x)*(1+x)*(1+x)*(1+x)=864.19
    x^2x
    x 4−125x 2 −40x+100+64 2=0
    276*(1+1.2*x)=280*(1+0.8*x)
    0.28*(1.2-x)^2=(0.8-x)^2
    π-arcsinx
    0.79*x*2.49*2.48=3.75
    0.69*0.66*2.79*x=2.35
    0.79*0.51*2.49*x=2.49
    400=x^2(x^2+1)(0.01x^2+1)
    25=x^2(x^2+1)(0.01x^2+1)
    x*0.66*2.79*1.16=1.47

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