X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=671899.91
    2(2x-1)-4(4x-1)-5(2x+1)-19=0
    2(2x-1)-4(4x-1)-5(2x-1)-19=0
    2-4(4x-1)-3(2x+1)-19=0
    2(2x-1)-4(4x-1)-5(2x+1)-19=0
    0.5*（250.78x+13.86x^2)*(376.17x+13.86x^2)/(41.58x+752.34)+33.03x-0.5*(250.78x+31.71x^2)*(376.17x+31.71x^2)/(752.34+95.13x)
    X-X/1.01*0.01-(X-X/1.01*0.01)*0.043=1359580.42
    (58-X)÷ln{(90-X)÷32}=47.6
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*2)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.6771)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.68753)
    1.5=1+[x/(300-x)]
    1.5=1+x/300-x
    X^2+1.8*10^-5－1.8*10^-6=0
    =x
    x+x*0.06=71.73
    x+x*0.06=71.73
    71.73=x+x*0.06
    71.73=x+x*0.06
    13=0.549X^2+0.131X^3

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