72×X÷(100+X)=2.44
    87×X÷(100+X)=2.44
    6*X=5
    9k^2-8k+4=0
    1.25 *2+1.25 *(x ÷10) *8=10*(1+15% )
    125 *20+125 *(x ÷100) *80=100*(1+15% )
    125 *20+125 *(x ^100) *80=100*(1+15% )
    { 0.5x+18 }{ 0.5x-18 } = { 74 }{ 65 }
    49z^2+95*36-24*36z=0
    45z^2+95*32-24*32z=0
    35-X＝4(X+5)
    9830.79+(9830.79+X)*1.1*1.003*0.003+X=39508.46
    70538.96+(70538.96+X)*1.1*1.003*0.003+X=99122.78
    2x=3÷3x+6
    23+5x=3x-6
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=90.355
    1800-X+135=400
    x（x-1）=-0.184
    x^4-x^3
    X*(X+1)*(25+X/20)=490000

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