(10+x-8)(200-20x)=640
    3+x=5
    0＝24322320x＋12210x^2+12112570690
    －12112515360＝221112x＋12210x^2
    2x/(1+x^2)
    14000000-765000x+206550x2-13122x3=0
    x+1+2x-7=0
    x+1-2x-7=0
    3x^4+6x^3-5x^2-6x+4=0
    3x^4+6x^3-5x^2-6x+4=0
    x/(15+3)+x÷(15-3)=7.5
    x-30=x÷3
    x(x-1)(x-2)
    cosx=0.0417
    (1-x)(1-x)-(x-1)(1-x^2)
    (1-x)^2-(x-1)(1-x^2)
    0.753sinx=cosx
    1.238sinx=cosx
    0.753sinx=cosx
    5m^2-5m+1=0

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